Retire the old build spec, and point every reference at the architecture (M0.1)

Development Plan M0.1. Every section reference in code, tests, specs/, the example config, the tuning guide, and the CLAUDE.md and README files now cites docs/Architecture.md (P, L, D, O, X, Q) instead of the old spec's A-H, and docs/Architecture-Build-Spec.md is deleted (git keeps it). The plan's old-to-new table goes with it. Mostly mechanical, with a per-site choice where one old section split: A4 became L2 where it meant stop/abandon/the loop and L3 where it meant approvals; A10 became L6 in the context-budget code and L7 elsewhere; B2 became D4 for outbound Gitea and publishing and D5 for review intake; 'A3 step N' became the matching step of L8's boot sequence. Comments describing behaviour the architecture drops (planning always escalating, thresholds tuned at an old build step) now describe the current code and point at the Development Plan. docs/Architecture.md gains one line the rewrite missed: intake outages delay but never fail work (old B2), now in L5, where the poller and Matrix code cite it. Comments and docs only; no behaviour change. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01PPQ14L3LikyefCMFBqEbKE
2026-10-01 00:17:48 +00:00
1 parent 890708594b
commit 1ad0b2147d
@@ -33,7 +33,7 @@ from nisse_dev.tools import Workspace
 from nisse_dev.worker import SerialWorker

 # How long shutdown waits for running work before leaving the store to the
-# durability layer (A2/A3). A milestone can run far longer than a service
+# durability layer (L8). A milestone can run far longer than a service
 # manager allows for a stop, and a hard exit mid-work is already safe.
 SHUTDOWN_WAIT_S = 10.0

@@ -52,14 +52,14 @@ def discover_models(config: AgentConfig, oplog: OpLog) -> ModelCatalog:
    catalog = ModelCatalog.discover(config.llm_base_url, config.llm_token)
    catalog.validate(config.roles.pinned())
    # Every role's context window must be known before a request is built
-    # against it (A10): a guess that is too large reaches a server that may
+    # against it (L6): a guess that is too large reaches a server that may
    # silently cut the prompt.
    catalog.require_limits(config.roles.pinned())
    for role in TOOL_DRIVING_ROLES:
        facts = catalog.facts(config.roles.resolve(role))
        if facts.supports_tools is False:
            # A warning, not a refusal: models LiteLLM declares tool-less are
-            # observed driving tool loops anyway, and A15 expects weak local
+            # observed driving tool loops anyway, and L9 expects weak local
            # models to be accommodated rather than excluded.
            oplog.emit(
                "model_tools_unsupported",
@@ -83,7 +83,7 @@ class Agent:
    _stopped: threading.Event

    def start(self) -> None:
-        """Boot in the order A3 requires: reconcile against external truth
+        """Boot in the order L8 requires: reconcile against external truth
        before accepting a single operator command."""
        self.worker.call(self.orchestrator.start)
        self.transport.start()
@@ -108,7 +108,7 @@ class Agent:
        try:
            self.worker.call(self.store.close, timeout=SHUTDOWN_WAIT_S)
        except TimeoutError:
-            pass  # still working; exiting mid-work is what A2/A3 are for
+            pass  # still working; exiting mid-work is what L8 are for
        self.worker.stop(timeout=SHUTDOWN_WAIT_S)
        self._stopped.set()

@@ -151,7 +151,7 @@ def make_llm_clients(
        )
    )
    # Delegations prefer the vendor-native route; fidelity is cheap
-    # elsewhere (A5). Which route a given model gets is decided by
+    # elsewhere (L9). Which route a given model gets is decided by
    # select_client, not by where the caller happens to sit.
    passthrough = budgeted(
        AnthropicPassthroughClient(
@@ -1,4 +1,4 @@
-"""Plan externalisation and Gitea-backed approvals (spec A4, Part H).
+"""Plan externalisation and Gitea-backed approvals (architecture L3, D2).

 Plans are posted as comments on a per-project Gitea issue. The approval
 comment — its author, timestamp, and revision tag — is the durable off-box
@@ -7,7 +7,7 @@ pointer to it, so boot reconciliation can re-derive gate state from Gitea
 even after the state volume is lost: external truth wins.

 Approvals arriving here bind to a revision exactly as they do over transport
-(A4). The first valid approval on any channel wins; the orchestrator echoes
+(L3). The first valid approval on any channel wins; the orchestrator echoes
 the outcome to the other channel so the records converge.
 """

@@ -1,4 +1,4 @@
-"""The operator's kill switch, as the working loops see it (spec A4).
+"""The operator's kill switch, as the working loops see it (architecture L2).

 `stop` has to reach work that is already running, from a thread that is not
 running it. So it is a flag, set by whoever hears the command and checked by
@@ -1,4 +1,4 @@
-"""Canonical transcript schema (spec A10).
+"""Canonical transcript schema (architecture L7).

 The durable record is this event log, never a provider-shaped ``messages``
 array; provider request bodies are rendered from it at call time. Canonical
@@ -6,7 +6,7 @@ tool-call IDs are minted locally — provider IDs are mapped at the boundary and
 never used as a join key.

 Transcript appends are the conversation record itself, not state-machine
-mutations, so they are deliberately outside the A9 state-change taxonomy.
+mutations, so they are deliberately outside the L12 state-change taxonomy.
 """

 import uuid
@@ -59,7 +59,7 @@ class DelegationStarted:
    model: str  # the alias asked for, e.g. "remote-architecture"
    caps: dict[str, Any]  # turns / tokens / wall-clock limits
    # What the alias resolved to at task start. An alias is free to change
-    # models between tasks, so eval history (A16) keyed on the alias alone
+    # models between tasks, so eval history (L9) keyed on the alias alone
    # would average results across whatever it happened to point at.
    backing_model: str = ""

@@ -1,4 +1,4 @@
-"""Runtime model discovery (spec A5, A11, A13).
+"""Runtime model discovery (architecture L9).

 LiteLLM is the VM's single LLM destination, which makes it the authority on
 what any given model *is*. Asking it at startup keeps vendor knowledge in one
@@ -186,7 +186,7 @@ class ModelCatalog:
            )

    def pinned(self, roles: Mapping[str, str]) -> dict[str, dict[str, Any]]:
-        """The resolved mapping to record at task start (A11, A16).
+        """The resolved mapping to record at task start (L9).

        Recording only the alias would let an alias that silently changes
        models muddle the eval history behind it: "remote-architecture: 80%
@@ -217,9 +217,9 @@ def select_client(
 ) -> LLMClient:
    """Choose the route from what the model *is*, not from what it is called.

-    A13 spells out the rule: use the vendor-native adapter where one exists,
+    L9 spells out the rule: use the vendor-native adapter where one exists,
    and otherwise provisionally accept LiteLLM's normalization for that
-    vendor -- validating it against the A16 eval set before trusting it with
+    vendor -- validating it against the L9 eval set before trusting it with
    delegations. There is deliberately no name-based fallback here: a second
    heuristic could disagree with the proxy, and an unknown model raises
    rather than quietly taking the normalized route.
@@ -1,4 +1,4 @@
-"""Agent configuration (spec A5: nothing hardcoded).
+"""Agent configuration (architecture L9: nothing hardcoded).

 Configuration is a YAML file: roles, connections, and the tuning knobs (see
 docs/Tuning-Guide.md). It holds no secrets. A credential is written as a
@@ -1,4 +1,4 @@
-"""The context budget (spec A10: token budgeting is a render-time concern).
+"""The context budget (architecture L6: token budgeting is a render-time concern).

 Every model call re-sends a transcript that only grows, and a model server
 does not always refuse one that no longer fits: Ollama silently drops the
@@ -1,4 +1,4 @@
-"""Control loop and state machine (spec A4, B1 subset).
+"""Control loop and state machine (architecture L2, L3; retired by M2.6).

 Gating is structural, not advisory: the agent's only actions are ``SubmitPlan``
 (posts the plan for approval and ends the agent's turn) and ``AskHuman``
@@ -8,7 +8,7 @@ arrives over transport. Every position change is checkpointed through the state
 store before the loop continues, so a restart lands mid-gate, not mid-air.

 All of it runs on one worker (nisse_dev.worker), never on the thread that
-delivered a message. The one exception is `stop` (A4), which has to reach
+delivered a message. The one exception is `stop` (L2), which has to reach
 work that is already running: the transport's thread sets the cancel flag
 directly, and the worker records the stop once the work has returned.
 """
@@ -57,12 +57,12 @@ TRANSITIONS = {
    (AWAIT_MILESTONE_SIGNOFF, MILESTONE_PLANNING),
    (AWAIT_MILESTONE_SIGNOFF, EXECUTING),
    (EXECUTING, PR_OPEN),
-    # PR acceptance is the milestone's final gate (B1): a merged PR is the
+    # PR acceptance is the milestone's final gate (D5): a merged PR is the
    # durable record, so completion returns to planning or to idle rather
    # than passing through a separate FINISHED state.
    (PR_OPEN, MILESTONE_PLANNING),
    (PR_OPEN, IDLE),
-    # abandon (A4, B2): the operator may end the task from any waiting state.
+    # abandon (L2): the operator may end the task from any waiting state.
    # (AWAIT_INPUT may go anywhere already.)
    (AWAIT_ARCH_SIGNOFF, IDLE),
    (AWAIT_MILESTONE_SIGNOFF, IDLE),
@@ -91,7 +91,7 @@ class PlanningError(RuntimeError):


 class PlanningStopped(RuntimeError):
-    """The operator said `stop` (A4) before a planning turn could run."""
+    """The operator said `stop` (L2) before a planning turn could run."""


@dataclass(frozen=True)
@@ -193,7 +193,7 @@ def _project_name(text: str) -> str:
 def _fresh_data() -> dict[str, Any]:
    return {
        # Latest revision per gate; revision numbers themselves run across
-        # the whole work item (last_rev), so rev-N names one plan (A4).
+        # the whole work item (last_rev), so rev-N names one plan (L3).
        "revs": {},
        "last_rev": 0,
        # The revision last put up for sign-off: a reply that names none
@@ -205,13 +205,13 @@ def _fresh_data() -> dict[str, Any]:
        "pending": None,
        "milestone": 1,
        "task_id": None,
-        "roles": None,  # A11 mapping, pinned at task start
+        "roles": None,  # L9 mapping, pinned at task start
        # What each pinned alias resolved to, discovered from LiteLLM. An
        # alias is free to point somewhere else tomorrow, so the transcript
-        # has to say what actually answered (A11, A16).
+        # has to say what actually answered (L9).
        "models": None,
        "pr": None,  # the open PR for the current milestone, once published
-        # Pointer to the Gitea plan record (Part H): the state store holds
+        # Pointer to the Gitea plan record (D2): the state store holds
        # only this, so gate state can be re-derived from Gitea after a
        # state-volume loss.
        "board": None,
@@ -244,7 +244,7 @@ class Orchestrator:
        self._executor = executor
        self._publisher = publisher
        self._operators = set(operators)
-        # Per-channel allowlists (A4): a Matrix MXID and a Gitea login
+        # Per-channel allowlists (L3): a Matrix MXID and a Gitea login
        # are different names for the same person, and neither implies
        # the other.
        self._gitea_operators = set(gitea_operators)
@@ -276,14 +276,14 @@ class Orchestrator:
        transport.on_message(self._handle)

    def start(self, reconcilers: Mapping[str, Reconciler] | None = None) -> None:
-        # A3 step 5 runs before the generic sweep: an interrupted delegation is
+        # L8 boot step 5 runs before the generic sweep: an interrupted delegation is
        # resumed or discarded by inspecting the branch and the log, and only a
        # genuinely unclean cut is left for the sweep below to gate on.
        if self._delegate is not None:
            with self._long_work():
                self._delegate.recover(self._transport.send_message)
        # The publisher owns the external-truth query for its own intents, so
-        # a configured publisher always contributes its reconciler (A3).
+        # a configured publisher always contributes its reconciler (L8).
        registered: dict[str, Reconciler] = dict(reconcilers or {})
        if self._publisher is not None:
            registered = {**self._publisher.reconcilers(), **registered}
@@ -317,7 +317,7 @@ class Orchestrator:
                pending={"kind": "boot", "interrupted": state.state},
            )
        elif state.state == AWAIT_INPUT and self._data.get("pending"):
-            # Waiting on the operator is a committed state (A3 step 8):
+            # Waiting on the operator is a committed state (L8 boot step 4):
            # nothing was in flight, and the question and what answering it
            # resumes are durable. Ask it again rather than replacing it.
            pending = self._data["pending"]
@@ -326,7 +326,7 @@ class Orchestrator:
                + pending.get("prompt", "my last question still stands")
            )
        elif state.state == EXECUTING and (published := self._published_pr()):
-            # A3 step 4: Gitea shows this milestone's PR open, so it was
+            # L8 boot step 3: Gitea shows this milestone's PR open, so it was
            # published and only PR_OPEN went unrecorded. Adopt the PR rather
            # than ask, and never publish it again. Nothing watched it yet,
            # so every comment on it is new.
@@ -347,7 +347,7 @@ class Orchestrator:
                "review comments"
            )
        elif state.state == PR_OPEN:
-            # Waiting on review is a committed state like a gate (A3 step
+            # Waiting on review is a committed state like a gate (L8 boot step
            # 8): resume, and watch the PR again from its cursor.
            pr = self._data.get("pr") or {}
            self._watch_pr(pr)
@@ -385,7 +385,7 @@ class Orchestrator:
                )
        else:
            # Interrupted mid-turn (planning, executing, unanswered question):
-            # never blind-resume (A3.6).
+            # never blind-resume (L8 boot step 5).
            self._await_input(
                cause=f"boot: restarted in {state.state}",
                prompt=f"restarted mid-{state.state}; {_BOOT_CHOICES}",
@@ -400,7 +400,7 @@ class Orchestrator:
        text = msg.text.strip()
        if command_form(text) == "stop":
            # Straight to the flag, not behind the work in the queue: the
-            # work is what it has to reach (A4).
+            # work is what it has to reach (L2).
            if self._worker.busy:
                self._cancel.set()
            self._worker.submit(lambda: self._finish_stop(msg))
@@ -478,7 +478,7 @@ class Orchestrator:
    def _halt_for_stop(
        self, *, what: str, note: str, next_step: str, pending: dict[str, Any]
    ) -> None:
-        """A4: stopped work moves to AWAIT_INPUT, and what happens next is the
+        """L2: stopped work moves to AWAIT_INPUT, and what happens next is the
        operator's call. The prompt asks why, because the model should hear
        the reason before it tries again."""
        self._halted_by_stop = True
@@ -494,7 +494,7 @@ class Orchestrator:
    def _handle_now(self, msg: InboundMessage, about: int | None = None) -> None:
        # Every operator message enters the canonical transcript, so planning
        # turns see feedback and answers as conversation rather than as
-        # out-of-band parameters (A10).
+        # out-of-band parameters (L7).
        self._store.append_event(
            UserMessage(
                text=(msg.original or msg.text).strip(),
@@ -555,7 +555,7 @@ class Orchestrator:

    def _begin_project(self, project: str) -> None:
        task_id = f"{project}-{uuid.uuid4().hex[:8]}"
-        # Pin the role mapping now (A11): a mid-task config change must not
+        # Pin the role mapping now (L9): a mid-task config change must not
        # split one task across two planners.
        pinned = self._roles.pinned() if self._roles is not None else None
        resolved = (
@@ -666,7 +666,7 @@ class Orchestrator:
    def _apply_gate_reply(
        self, *, sender: str, text: str, channel: str, about: int | None = None
    ) -> None:
-        """Shared by every approval source (A4). The allowlist is per channel:
+        """Shared by every approval source (L3). The allowlist is per channel:
        a Matrix MXID and a Gitea login are different names, and holding one
        says nothing about holding the other."""
        gate_data = self._data["gate"]
@@ -771,7 +771,7 @@ class Orchestrator:

    def _echo_outcome(self, deciding_channel: str, text: str) -> None:
        """A gate satisfied on one channel is echoed to the other, so neither
-        record silently disagrees about what was approved (A4)."""
+        record silently disagrees about what was approved (L3)."""
        board_state = self._data.get("board")
        if deciding_channel != "gitea" and self._board is not None and board_state:
            self._board.echo(board_state["issue"], text)
@@ -792,7 +792,7 @@ class Orchestrator:
        # Which comment put which revision up: a Gitea reply binds to the
        # latest plan posted before it, since comment IDs only grow.
        board_state.setdefault("posts", []).append([post.comment_id, rev])
-        # Approvals can arrive on the issue as well as over transport (A4),
+        # Approvals can arrive on the issue as well as over transport (L3),
        # so watch it for as long as the gate stands. A new revision skips
        # what came before it: an early "approve" must not approve it.
        board_state["last_comment"] = self._watch(
@@ -801,7 +801,7 @@ class Orchestrator:
        self._save(f"{gate_name} rev-{rev} posted to Gitea")

    def handle_plan_comment(self, comment: Any) -> None:
-        """A comment on the project issue may satisfy an open plan gate (A4).
+        """A comment on the project issue may satisfy an open plan gate (L3).

        Approvals bind to a revision here exactly as over transport, and the
        first valid approval on either channel wins. Called from the poller
@@ -837,12 +837,12 @@ class Orchestrator:
        )

    def handle_review_comment(self, comment: Any) -> None:
-        """React to a PR review comment (B2). Called from the poller thread.
+        """React to a PR review comment (D5). Called from the poller thread.

        Comment authors are checked against the Gitea operator allowlist:
        a PR comment is an instruction channel into an agent that writes
-        code, so it is operator-scoped like any other (A4, and the same
-        reasoning C4 applies to tickets).
+        code, so it is operator-scoped like any other (L11, and the same
+        reasoning O5 applies to tickets).
        """
        self._worker.call(
            lambda: self._settled(
@@ -991,7 +991,7 @@ class Orchestrator:
        )

    def _abandon(self, sender: str) -> None:
-        """End the task on the operator's word (A4: continue, re-plan, or
+        """End the task on the operator's word (L2: continue, re-plan, or
        abandon), closing its Gitea records. Only reached from a waiting
        state: while work runs the reply is "busy; say 'stop'" instead.

@@ -1196,7 +1196,7 @@ class Orchestrator:
                )

    def _resume_after_restart(self, pending: dict[str, Any], text: str) -> None:
-        """Answer to the question a restart asks (A3 step 7). Never a blind
+        """Answer to the question a restart asks (L8 boot step 5). Never a blind
        resume: 'continue' re-runs the interrupted planning turn, or returns
        an interrupted milestone to its approved plan to be started again."""
        choice = command_form(text)
@@ -1,4 +1,4 @@
-"""Delegation harness (spec A13).
+"""Delegation harness (architecture L9).

 Escalation is delegation, not consultation: a frontier model receives a scoped
 sub-task, works autonomously with full tool access, and hands back. The local
@@ -17,7 +17,7 @@ resuming on top of a half-edited tree.

 **Checkpointing as it happens.** Every tool call, result, and assistant turn
 is written to the canonical log when it occurs, never batched at handback.
-That is what makes a delegation resumable after a crash (A3).
+That is what makes a delegation resumable after a crash (L8).

 Scope is bounded by construction: a delegation is handed a sub-task the
 approved plan already contains. It is smart, not authorised to widen the work.
@@ -144,7 +144,7 @@ class DelegationResult:

        The work on the branch may be perfectly good, so it is preserved and
        the intent left pending: the next boot treats it exactly like a crash
-        mid-delegation (A3) and resumes if the cut was clean. Discarding here
+        mid-delegation (L8) and resumes if the cut was clean. Discarding here
        would throw away work because the budget ran out.
        """
        return self.status == "interrupted"
@@ -152,7 +152,7 @@ class DelegationResult:
    @property
    def usable(self) -> bool:
        """Only a successful handback may be built upon. A cap breach, a
-        failure or an operator's stop leaves a half-edited tree, which A13
+        failure or an operator's stop leaves a half-edited tree, which L9
        says must gate rather than be resumed."""
        return self.status == "handback" and self.handback is not None

@@ -190,7 +190,7 @@ class Delegation:
        started_at = self._now()
        base_branch = self._git.current_branch()
        # Recorded before the branch exists, so a crash anywhere after this
-        # leaves a durable statement of what was in flight (A2/A3).
+        # leaves a durable statement of what was in flight (L8).
        intent_id = self._store.begin_intent(
            DELEGATION_INTENT,
            {
@@ -234,12 +234,12 @@ class Delegation:
        )
        if result.interrupted:
            # Leave the branch and the intent alone: this delegation is not
-            # finished, it was cut off, and A3's resume rule is exactly the
+            # finished, it was cut off, and L8's resume rule is exactly the
            # machinery for picking it back up.
            return result
        if not result.usable:
            # Abort discards the branch: the caller must never resume on top
-            # of a partially-edited tree (A13).
+            # of a partially-edited tree (L9).
            self._abandon(branch, base_branch)
        # Settled either way: an aborted delegation is a *finished* one, and
        # leaving the intent pending would make the next boot think work was
@@ -248,12 +248,12 @@ class Delegation:
        return result

    def resume(self, intent: Intent) -> DelegationResult:
-        """Continue a delegation the process died in the middle of (A3 step 5).
+        """Continue a delegation the process died in the middle of (L8 boot step 5).

        The transcript is already in the canonical log, so the loop re-renders
        it and carries on. No new branch and no second ``delegation_started``:
        this is the same delegation, which is why its vendor-opaque reasoning
-        may still be replayed (A10 defines a session as the delegation, not the
+        may still be replayed (L7 defines a session as the delegation, not the
        process lifetime).
        """
        payload = intent.payload
@@ -284,7 +284,7 @@ class Delegation:
        return result

    def recover(self, notify: Callable[[str], None]) -> DelegationResult | None:
-        """Sweep pending delegation intents at boot (A3 step 5).
+        """Sweep pending delegation intents at boot (L8 boot step 5).

        Settles what is already finished, discards what never started, resumes
        a clean cut — announcing it with a *notice*, not a question, because a
@@ -363,7 +363,7 @@ class Delegation:
                    tokens=spent,
                )
            # Metered from what the provider reported, not estimated. The cap
-            # is a scope limit (A13), distinct from the money cap A5 keeps on
+            # is a scope limit (L9), distinct from the money cap L9 keeps on
            # the LiteLLM key — but an unbounded delegation can still exhaust
            # a daily budget and take external models away until it resets.
            usage = getattr(self._client, "last_usage", {}) or {}
@@ -380,7 +380,7 @@ class Delegation:

            calls: list[ToolCall] = []
            for event in produced:
-                # Checkpoint as it arrives, never batched at handback (A13):
+                # Checkpoint as it arrives, never batched at handback (L9):
                # this is what makes the delegation resumable after a crash.
                self._store.append_event(event)
                if isinstance(event, ToolCall):
@@ -475,7 +475,7 @@ class Delegation:

            # Commit each turn's work onto the delegation branch, so that
            # discarding the branch really does discard the work, and so a
-            # crash leaves the branch at a known commit (A3).
+            # crash leaves the branch at a known commit (L8).
            self._commit_turn(turn)

        return DelegationResult(
@@ -504,7 +504,7 @@ class Delegation:


 def _parse_handback(arguments: dict[str, Any]) -> Handback | None:
-    """Validated locally rather than trusted: A14's rule for prompt-level
+    """Validated locally rather than trusted: L9's rule for prompt-level
    structured output applies to the handback too."""
    required = ("changed", "now_true", "next")
    if any(not str(arguments.get(key, "")).strip() for key in required):
@@ -521,10 +521,10 @@ def _parse_handback(arguments: dict[str, Any]) -> Handback | None:


 def delegation_reconciler(store: StateStore, git_repo: GitRepo) -> Reconciler:
-    """A3 step 5: decide whether an interrupted delegation may be resumed.
+    """L8 boot step 5: decide whether an interrupted delegation may be resumed.

    The judgement is an observable check, never model self-assessment — the
-    same reasoning as A12. Returns:
+    same reasoning as L9. Returns:

    - ``True``  the delegation is settled or cleanly resumable
    - ``False`` it never really started, so there is nothing to resume
@@ -534,7 +534,7 @@ def delegation_reconciler(store: StateStore, git_repo: GitRepo) -> Reconciler:
    existing and carrying the delegation's commits: per-turn shas are not
    recorded in the log today, so a branch rewritten out from under us would
    not be detected. Stated rather than glossed, because the check is weaker
-    than A3's wording implies.
+    than L8's wording implies.
    """

    def check(intent: Intent) -> bool | None:
@@ -549,7 +549,7 @@ def delegation_reconciler(store: StateStore, git_repo: GitRepo) -> Reconciler:
 def delegation_verdict(
    store: StateStore, git_repo: GitRepo, intent: Intent
 ) -> Literal["resume", "settled", "absent", "gate"]:
-    """The A3 step 5 decision, separated from the Reconciler contract because
+    """The L8 boot step 5 decision, separated from the Reconciler contract because
    boot must *act* on it — resuming is not the same as judging settled."""
    branch = intent.payload.get("branch")
    if not branch:
@@ -564,7 +564,7 @@ def delegation_verdict(
    last = events[-1].event
    if isinstance(last, ToolCall):
        # A call with no recorded result: its effect is unknown and cannot be
-        # verified by inspection, so gate (A3).
+        # verified by inspection, so gate (L8).
        return "gate"
    if not isinstance(last, AssistantText | ToolResult):
        return "gate"
@@ -1,4 +1,4 @@
-"""Minimal .env loader (spec A5: config from env/.env, nothing hardcoded).
+"""Minimal .env loader (architecture L12: secrets from env/.env, nothing hardcoded).

 Deliberately tiny: KEY=VALUE lines, comments and blanks ignored, existing
 environment variables never overridden (real env wins over the file).
@@ -1,4 +1,4 @@
-"""Delegation and consult evaluation capture (spec A16).
+"""Delegation and consult evaluation capture (architecture L9).

 Each ``delegation_started`` / ``delegation_completed`` pair is already a clean
 input-output record; this pairs them up and attaches a verdict, so "best model
@@ -40,7 +40,7 @@ def collect(store: StateStore, after: int = 0) -> list[EvalRecord]:
    """Pair each start with the completion that follows it.

    A start with no completion is skipped rather than reported half-formed:
-    it means the process died mid-delegation, which A3 handles, and an
+    it means the process died mid-delegation, which L8 handles, and an
    unfinished record would pollute the eval set.
    """
    verdicts = store.outcomes()
@@ -1,10 +1,10 @@
-"""Local executor loop (spec A12 escalation triggers, A15 accommodations).
+"""Local executor loop (architecture L9 escalation triggers, L9 accommodations).

 Runs the approved plan with the executor role — the cheap local model doing
 mechanical work. Every tool call and result is checkpointed to the canonical
-log as it happens (A13), so a crash mid-milestone leaves a resumable record.
+log as it happens (L9), so a crash mid-milestone leaves a resumable record.

-Escalation is decided from outside the model (A12): consecutive command
+Escalation is decided from outside the model (L9): consecutive command
 failures and hard caps on turns, never the model's own claim that it is stuck
 or finished-enough. Until delegation exists (step 7), an escalation gates to
 the human with the failures attached rather than engaging a frontier model.
@@ -115,7 +115,7 @@ class LLMExecutor:
    def _escalate(
        self, milestone: int, failures: int, last_failure: str
    ) -> ExecutorOutcome | None:
-        """Hand the sub-task to a stronger model, per A12.
+        """Hand the sub-task to a stronger model, per L9.

        Returns None when the delegation handed back usable work and the local
        loop should carry on; an ExecutorOutcome when the caller must stop.
@@ -124,7 +124,7 @@ class LLMExecutor:
        if self._delegate is None:
            return ExecutorOutcome("escalate", note)

-        # A12 says the failures go in the brief: the delegate must not have to
+        # L9 says the failures go in the brief: the delegate must not have to
        # rediscover what the local model already learned the hard way.
        brief = (
            f"Milestone {milestone} is stuck. The local executor tried and its "
@@ -140,14 +140,14 @@ class LLMExecutor:
            return None
        if result.status == "stopped":
            return ExecutorOutcome("stopped", f"during a delegation: {result.note}")
-        # A13: a cap breach or failure leaves a half-edited tree, so the local
+        # L9: a cap breach or failure leaves a half-edited tree, so the local
        # loop must not resume on top of it.
        return ExecutorOutcome(
            "escalate", f"{note}; delegation {result.status}: {result.note}"
        )

    def _tools(self) -> list[dict[str, Any]]:
-        # A12: ask_expert exists in addition to the observable escalation
+        # L9: ask_expert exists in addition to the observable escalation
        # triggers, never as a replacement for them.
        if self._expert is None:
            return [*EXECUTOR_TOOLS, FINISH_TOOL]
@@ -203,7 +203,7 @@ class LLMExecutor:
        prose_nudged = False

        for turn in range(self._max_turns):
-            # A4: `stop` takes effect at the next tool boundary. The start of
+            # L2: `stop` takes effect at the next tool boundary. The start of
            # a turn is one, and so is the gap between two tool calls below.
            if self._cancel.requested:
                return ExecutorOutcome("stopped", f"before turn {turn + 1}")
@@ -267,7 +267,7 @@ class LLMExecutor:
                elif call.tool not in offered:
                    # A model inventing tools is not doing the work, and with
                    # no server enforcement nothing else would stop it, so it
-                    # counts toward escalation like a failed command (A12).
+                    # counts toward escalation like a failed command (L9).
                    outcome = ToolOutcome(
                        f"no such tool: {call.tool}; the tools are "
                        + ", ".join(sorted(offered)),
@@ -294,7 +294,7 @@ class LLMExecutor:
                        0 if outcome.success else consecutive_failures + 1
                    )
                    if consecutive_failures >= self._failure_limit:
-                        # A12: this is the trigger delegation exists for.
+                        # L9: this is the trigger delegation exists for.
                        # Escalating to the human is the fallback when there
                        # is no delegate, not the intended path.
                        escalation = self._escalate(
@@ -1,23 +1,23 @@
-"""`ask_expert` (spec A14).
+"""`ask_expert` (architecture L9).

 The one case delegation does not cover: a question needing no repo access —
 "which of these two approaches is better", "is this API deprecated". A single
 stateless call, a text answer, no session state, no diff application.

-Two constraints from A14 shape the implementation:
+Two constraints from L9 shape the implementation:

 **Structured output is contracted at the prompt level, not the API level.**
 Vendors differ on JSON mode and schema enforcement, so the answer is parsed and
 validated against a local schema, with one retry. This runs over LiteLLM's
-*normalized* route, which A13 reserves for calls where fidelity is cheap.
+*normalized* route, which L9 reserves for calls where fidelity is cheap.

 **A per-task budget**, so a confused executor cannot spend twenty consults
 circling. The count comes from the canonical log rather than a counter in
 memory: it survives a restart, and it is observable from outside the model,
-which is the same reasoning A12 applies to escalation triggers.
+which is the same reasoning L9 applies to escalation triggers.

 Consults are recorded as ``delegation_started`` / ``delegation_completed`` with
-role ``consultant``. That is deliberate — A16 wants a "consult/delegation eval
+role ``consultant``. That is deliberate — L9 wants a "consult/delegation eval
 set", and reusing the composite events gets consult evaluation for free rather
 than inventing a parallel record.
 """
@@ -150,7 +150,7 @@ class ExpertDesk:
        last = "no reply"
        for attempt in (1, 2):
            try:
-                # Stateless by design (A14): the question travels as a
+                # Stateless by design (L9): the question travels as a
                # synthesised message that is never appended to the log, so a
                # consult neither depends on nor leaks repo context. It cannot
                # ride in the system prompt alone — the Messages API requires
@@ -1,4 +1,4 @@
-"""Approval gating primitives (spec A4).
+"""Approval gating primitives (architecture L3).

 Approvals bind to a plan revision, never to "the current gate": every revision
 carries a monotonic ``rev-N`` tag, an approval naming a stale revision is
@@ -1,4 +1,4 @@
-"""Git operations for the agent's workspace (spec B2 outbound).
+"""Git operations for the agent's workspace (architecture D4).

 Push authentication uses the Gitea service-account token embedded in the
 remote URL. The token is never written to disk in the repo config and is
@@ -110,7 +110,7 @@ class GitRepo:
    def discard_branch(self, branch: str, *, back_to: str) -> None:
        """Throw away a branch and everything on it.

-        Used when a delegation aborts: A13 gives a delegation the same
+        Used when a delegation aborts: L9 gives a delegation the same
        atomicity that reconciliation gives an interrupted transition, and
        half-finished work must not survive to be built upon.
        """
@@ -1,12 +1,12 @@
-"""Gitea client (spec B2).
+"""Gitea client (architecture D4, D5).

 Outbound: open PRs and post comments through a dedicated service account with
 a scoped token. Inbound is deliberately *polled* rather than webhook-driven,
-so the agent VM stays outbound-only (B3), and intake is structured JSON —
+so the agent VM stays outbound-only (D7), and intake is structured JSON —
 never routed through a chat bridge.

 ``find_pull_request`` is the external-truth query that makes opening a PR
-idempotent across a crash: boot reconciliation (A3) asks Gitea whether the
+idempotent across a crash: boot reconciliation (L8) asks Gitea whether the
 effect already happened rather than repeating it.
 """

@@ -84,7 +84,7 @@ class GiteaClient:
        return _pull_request(data)

    def find_pull_request(self, repo: str, head: str) -> PullRequest | None:
-        """External truth for A3: did the PR for this branch already get
+        """External truth for L8: did the PR for this branch already get
        opened? Includes closed PRs — a crash after opening must not be
        answered with "no PR is open, so open another".

@@ -169,7 +169,7 @@ def _pull_request(data: dict[str, Any]) -> PullRequest:


 def pull_request_reconciler(client: GiteaClient, repo: str) -> Reconciler:
-    """Reconciler for an ``open_pr`` intent (A3 step 4).
+    """Reconciler for an ``open_pr`` intent (L8 boot step 2).

    An unreachable Gitea yields None — unverifiable, so the agent gates to
    the human rather than risking a duplicate PR. That is the conservative
@@ -1,11 +1,11 @@
-"""LLM access (spec A5, A11).
+"""LLM access (architecture L9).

 One client interface, present from the first real LLM call. All traffic goes
 to the LiteLLM proxy — the VM's single LLM destination; the agent holds one
 LiteLLM token and no vendor credentials. The base URL and token come from the
 agent's config (nisse_dev.config), nothing hardcoded.

-Model identity is expressed as roles (A11), resolved to concrete model strings
+Model identity is expressed as roles (L9), resolved to concrete model strings
 from config; the resolved mapping is pinned at task start so a mid-task
 config change cannot split a task across two planners.
 """
@@ -34,7 +34,7 @@ class LLMError(RuntimeError):

 # A rate limit is a transient condition, not a bad request. Losing a
 # ten-turn delegation to one wastes far more tokens than waiting out the
-# window, so retry once before surfacing it (A13's caps still bound the
+# window, so retry once before surfacing it (L9's caps still bound the
 # total).
 RATE_LIMIT_STATUS = 429
 RATE_LIMIT_RETRY_S = 20.0
@@ -71,7 +71,7 @@ class BudgetExhausted(UpstreamUnavailable):
    Distinct from the rest of its family because it will not clear on its
    own within the hour: an exhausted daily budget takes external models away
    until it resets, so retrying wastes time and the operator needs telling.
-    A5 keeps the budget itself at the proxy; recognising its refusal is ours.
+    L9 keeps the budget itself at the proxy; recognising its refusal is ours.
    """


@@ -120,7 +120,7 @@ class RoleMap:
        return str(getattr(self, role))

    def pinned(self) -> dict[str, str]:
-        """The full resolved mapping, to record at task start (A11)."""
+        """The full resolved mapping, to record at task start (L9)."""
        return asdict(self)


@@ -144,7 +144,7 @@ class LiteLLMClient:
        self._renderer = OpenAIChatRenderer()
        self._sleep = sleep
        self._max_tokens = max_tokens or DEFAULT_MAX_OUTPUT_TOKENS
-        # Set after each call so a caller can meter itself (A13 caps);
+        # Set after each call so a caller can meter itself (L9 caps);
        # a side channel rather than a return value, so the LLMClient
        # protocol stays the same for every implementation.
        self.last_usage: dict[str, int] = {}
@@ -211,13 +211,13 @@ class LiteLLMClient:
        out: list[CanonicalEvent] = []
        if message.get("content"):
            out.append(AssistantText(text=message["content"], model=produced_by))
-        # Provider tool-call IDs are mapped at the boundary (A10): each call
+        # Provider tool-call IDs are mapped at the boundary (L7): each call
        # gets a locally-minted canonical ID; the provider's is dropped, since
        # every future request is rendered wholly from the canonical log.
        for call in message.get("tool_calls") or []:
            raw = call["function"]["arguments"] or "{}"
            # Weak models emit truncated or non-JSON argument strings; that is
-            # a bad model turn, not a client crash (A15).
+            # a bad model turn, not a client crash (L9).
            try:
                arguments = json.loads(raw)
            except json.JSONDecodeError as exc:
@@ -244,10 +244,10 @@ class LiteLLMClient:


 class AnthropicPassthroughClient:
-    """LiteLLM's Anthropic passthrough (A5). Same interface as LiteLLMClient,
+    """LiteLLM's Anthropic passthrough (L9). Same interface as LiteLLMClient,
    so a caller chooses a route rather than a different kind of client.

-    Delegations take this path because fidelity matters there (A13);
+    Delegations take this path because fidelity matters there (L9);
    ask_expert and fallbacks use the normalized route, where it does not.
    """

@@ -340,7 +340,7 @@ class AnthropicPassthroughClient:
                out.append(AssistantText(text=block["text"], model=produced_by))
            elif kind == "tool_use":
                # Provider ids are mapped at the boundary and never used as a
-                # join key (A10); the canonical log owns identity.
+                # join key (L7); the canonical log owns identity.
                out.append(
                    ToolCall(
                        call_id=mint_call_id(),
@@ -349,7 +349,7 @@ class AnthropicPassthroughClient:
                    )
                )
            # Vendor-opaque reasoning blocks (thinking, redacted_thinking) are
-            # deliberately dropped for now: A10 requires storing them tagged
+            # deliberately dropped for now: L7 requires storing them tagged
            # with the producing model and never replaying them outside the
            # session that made them, and the canonical schema has no event
            # for that yet. Nothing requests extended thinking, so none arrive.
@@ -378,7 +378,7 @@ def _post_with_rate_limit_retry(
    raise AssertionError("unreachable")


-# Model families we have a native renderer adapter for. A13: delegations take
+# Model families we have a native renderer adapter for. L9: delegations take
 # the vendor's passthrough route because a normalising middlebox is lossy
 # exactly where a long-running delegation lives.
 def _response_cost(response: httpx.Response) -> float:
@@ -1,7 +1,7 @@
 """Entry point for the dev agent.

 Loads configuration, builds the agent, and stays up until told to stop.
-Shutdown is deliberate rather than abrupt: A2's durability guarantees assume
+Shutdown is deliberate rather than abrupt: L8's durability guarantees assume
 the process may die at any moment, but a clean stop still beats relying on
 them.
 """
@@ -1,4 +1,4 @@
-"""MatrixTransport (spec A1): Matrix as strictly a UI channel.
+"""MatrixTransport (architecture L5): Matrix as strictly a UI channel.

 Implements the Transport interface directly over the Matrix client-server HTTP
 API (token auth, /sync long-poll, /send) with the httpx client already in the
@@ -6,7 +6,7 @@ dependency tree — no Matrix SDK. The surface used is four endpoints; an SDK
 earns its keep when E2E arrives, and bot rooms are created unencrypted until
 then, so encrypted rooms are not supported here.

-Inbound handling follows B2's polling posture: on homeserver errors the sync
+Inbound handling follows L5's intake posture: on homeserver errors the sync
 loop backs off (capped) and retries indefinitely — an outage delays reactions
 but never fails anything.
 """
@@ -101,7 +101,7 @@ class MatrixTransport:
    def start(self) -> None:
        """Begin delivering new room messages to the registered callback.
        History from before start() is never delivered (Matrix room history
-        must not become load-bearing context, A1)."""
+        must not become load-bearing context, L5)."""
        if self._callback is None:
            raise TransportError("no message handler registered; call on_message first")
        self._stop.clear()
@@ -184,7 +184,7 @@ class MatrixTransport:
        """Who a leading mention addresses, and the body without a leading
        mention of this agent. Only the start of the message counts: a
        mention later on ("approve, cc @alice") is part of the text. The
-        sender is never read from here; it comes from the event (A4)."""
+        sender is never read from here; it comes from the event (L3)."""
        body: str = content["body"]
        own = self._config.user_id
        if content.get("format") == "org.matrix.custom.html":
@@ -1,4 +1,4 @@
-"""Structured operational logging (spec A9).
+"""Structured operational logging (architecture L12).

 One JSON object per line to stderr (journald captures it when running as a
 service). Every event carries the fixed envelope: ts, agent, event, task_id,
@@ -16,7 +16,7 @@ class OpLog:
    def __init__(self, agent: str, stream: TextIO | None = None) -> None:
        self.agent = agent
        # Correlation ID for the enclosing unit of work; the orchestrator sets
-        # it when a unit starts and clears it when the unit ends (A9).
+        # it when a unit starts and clears it when the unit ends (L12).
        self.task_id: str | None = None
        self._stream = stream if stream is not None else sys.stderr

@@ -1,11 +1,11 @@
-"""LLM-backed planning agent (spec A4 gating, A11 roles, A13 plan quality).
+"""LLM-backed planning agent (architecture L3 approvals, L9 roles, D2 plans).

 Gating is structural at the tool layer: the planner is offered exactly two
 tools — ``submit_plan``, which posts a plan for approval and ends the turn,
 and ``ask_human``, which pauses for an answer. No "proceed" tool exists, so
 the model has no path to advance itself past a gate.

-Model output is appended to the canonical log as it arrives (A2/A10), so a
+Model output is appended to the canonical log as it arrives (L8/L7), so a
 crash mid-planning leaves a truthful transcript.
 """

@@ -18,7 +18,9 @@ from nisse_dev.llm import BudgetExhausted, LLMClient, LLMError, RoleMap
 from nisse_dev.state import StateStore

 # Plans may be executed by a materially weaker model, which cannot
-# reconstruct intent (A13).
+# reconstruct intent. This predates the architecture's capability profiles
+# and plans that specify rather than implement (L9, D2); Development Plan
+# M2.3 replaces it.
 SYSTEM_PROMPT = """You are nisse-dev, a software engineering agent.

 You are planning, not implementing. Produce plans that are explicit and
@@ -132,7 +134,7 @@ class LLMPlanningAgent:
        self, model: str, system: str
    ) -> tuple[SubmitPlan | AskHuman | None, str | None]:
        """A malformed or failed call is a bad turn, not a crash: the caller
-        retries once and then gates to the human (A12 — judgment about model
+        retries once and then gates to the human (L9 — judgment about model
        output is observable, never the model's own claim)."""
        try:
            return self._turn(model, system), None
@@ -1,10 +1,10 @@
-"""Gitea comment intake (spec B2).
+"""Gitea comment intake (architecture D5).

-Polling, not webhooks: the agent VM stays outbound-only (B3), so nothing
+Polling, not webhooks: the agent VM stays outbound-only (D7), so nothing
 needs to reach in. Intake is structured JSON straight from the API and never
 routed through a chat bridge.

-Outage posture, per B2: back off exponentially, cap at a few minutes, retry
+Outage posture, per L5: back off exponentially, cap at a few minutes, retry
 indefinitely, and log. Polling is pure intake — an outage delays a reaction
 but must never fail a task or force a state transition.
 """
@@ -1,4 +1,4 @@
-"""Publishing a finished milestone as a Gitea PR (spec B2, A2/A3).
+"""Publishing a finished milestone as a Gitea PR (architecture D4, L8).

 The ordering here is the whole point. Intent is recorded *before* the first
 externally visible act, so a crash anywhere in the sequence leaves a durable
@@ -164,8 +164,8 @@ def _pr_body(milestone: int, plan: str, service_url: str | None) -> str:
        plan,
    ]
    if service_url:
-        # B2: a runnable test service's address belongs in the PR description
+        # D4: a runnable test service's address belongs in the PR description
        # so a reviewer can exercise it. Nothing reports one yet; the browser
-        # tool (A6) is what will.
+        # tool (D7) is what will.
        parts += ["", "## Running test service", "", service_url]
    return "\n".join(parts)
@@ -1,4 +1,4 @@
-"""Boot-time reconciliation (spec A3): turn an ambiguous crash into a safe,
+"""Boot-time reconciliation (architecture L8): turn an ambiguous crash into a safe,
 known state.

 Every pending intent found at startup is checked against external truth by a
@@ -1,10 +1,10 @@
-"""A10 renderer: provider request bodies are built from the canonical log at
+"""L7 renderer: provider request bodies are built from the canonical log at
 call time, never stored provider-shaped.

 First adapter: the OpenAI-compatible chat format LiteLLM's normalized route
-speaks — the executor role's path (A5). The Anthropic passthrough adapter
-arrives with delegations (A13). Token budgeting and prompt-cache breakpoints
-are render-time concerns and are never stored (A10); neither exists yet in
+speaks — the executor role's path (L9). The Anthropic passthrough adapter
+arrives with delegations (L9). Token budgeting and prompt-cache breakpoints
+are render-time concerns and are never stored (L7); neither exists yet in
 this skeleton.
 """

@@ -63,7 +63,7 @@ class OpenAIChatRenderer:
            _append_merged(messages, self._message_for(stored.event))
            # Providers reject a tool call with no result following it. One
            # can legitimately be missing: a crash between the call and its
-            # result (A3), or a turn-ending gate tool. Render a placeholder so
+            # result (L8), or a turn-ending gate tool. Render a placeholder so
            # the transcript stays replayable rather than poisoned.
            if isinstance(stored.event, ToolCall) and (
                stored.event.call_id not in answered
@@ -1,6 +1,6 @@
-"""Anthropic Messages renderer (spec A10, A13).
+"""Anthropic Messages renderer (architecture L7, L9).

-The second adapter, and the reason A13 puts normalisation in the renderer
+The second adapter, and the reason L9 puts normalisation in the renderer
 rather than on the wire: the two vendors disagree *structurally*, not
 cosmetically.

@@ -71,7 +71,7 @@ class AnthropicMessagesRenderer:
            blocks.extend(self._blocks_for(stored.event))
            # A dangling tool_use is rejected outright by this API — more
            # strictly than the OpenAI shape — so a crash between a call and
-            # its result must not poison the transcript (A3).
+            # its result must not poison the transcript (L8).
            if isinstance(stored.event, ToolCall) and (
                stored.event.call_id not in answered
            ):
@@ -1,4 +1,4 @@
-"""Durable state store (spec A2).
+"""Durable state store (architecture L8).

 SQLite in WAL mode with ``synchronous=FULL``: every commit is fsynced, so a
 power cut mid-write can never produce torn state. Every state transition and
@@ -127,7 +127,7 @@ class StateStore:
        migrations: Mapping[int, Migration] = MIGRATIONS,
        oplog: OpLog | None = None,
    ) -> None:
-        # Log emission is owned by the store (A9): the same code path that
+        # Log emission is owned by the store (L12): the same code path that
        # performs a durable write emits its log line, right after commit.
        self.oplog = oplog if oplog is not None else OpLog("nisse-dev")
        self._conn = sqlite3.connect(path, isolation_level=None)
@@ -291,7 +291,7 @@ class StateStore:
        ]

    def append_event(self, event: CanonicalEvent) -> int:
-        """Append to the canonical transcript (A10); committed and fsynced
+        """Append to the canonical transcript (L7); committed and fsynced
        before return, like every other durable write."""
        cursor = self._conn.execute(
            "INSERT INTO canonical_events (ts, type, payload) VALUES (?, ?, ?)",
@@ -314,7 +314,7 @@ class StateStore:
        ]

    def mark_outcome(self, event_id: int, verdict: str, note: str = "") -> None:
-        """Record whether a delegation or consult was good (A16).
+        """Record whether a delegation or consult was good (L9).

        Kept out of the canonical log on purpose: the log is an append-only
        record of what happened, and a verdict is a later judgement about it
@@ -1,11 +1,11 @@
-"""Executor tools (spec A15: reduced schema, flat arguments).
+"""Executor tools (architecture L9: reduced schema, flat arguments).

-Deliberately unsandboxed. The VM is the trust boundary (B3) and tool use is
-auto-approved inside an approved unit of work (A4), so per-command
+Deliberately unsandboxed. The VM is the trust boundary (D7) and tool use is
+auto-approved inside an approved unit of work (L3), so per-command
 confinement would add failure modes without adding safety. The workspace is
 where work happens — the default for relative paths and the command cwd — not
 a wall. Protecting agent state from the agent is a mount-layout concern
-(A2/B3), not this module's job.
+(L8/D7), not this module's job.

 What *is* enforced here is operational: commands cannot hang the loop, cannot
 consume the context window with megabytes of build log, and do not inherit
@@ -153,7 +153,7 @@ class Workspace:

    def write_file(self, path: str, content: str) -> ToolOutcome:
        target = self._resolve(path)
-        # Not a sandbox — the VM is the trust boundary (B3). This is about the
+        # Not a sandbox — the VM is the trust boundary (D7). This is about the
        # work existing at all: a file written outside the repo is invisible
        # to git, so the milestone would publish an empty PR while the model
        # truthfully reports success. Models do guess plausible absolute paths
@@ -1,4 +1,4 @@
-"""Transport interface (spec A1): all human-to-agent conversation.
+"""Transport interface (architecture L5): all human-to-agent conversation.

 The orchestrator depends only on this interface; no platform SDK is imported
 anywhere outside a concrete implementation. MatrixTransport arrives as its own
@@ -3,7 +3,7 @@
 Planning turns, milestones and review responses can each run for minutes.
 Running them on the thread that delivered the message blocked that thread for
 as long: the Matrix sync loop read nothing new until the work finished, so an
-operator's `stop` (A4) would only have arrived after the work it was meant to
+operator's `stop` (L2) would only have arrived after the work it was meant to
 stop. Every handler now runs here instead, and transports only hand work over.

 Owning the store is the other half. SQLite connections are bound to the thread