Threads, commands and labels on the new loop (M2.3)

- Commands that name their item ("go #14", "abandon #14", "stop #14")
  apply to it wherever they're said; go, approve and abandon alone at top
  level are asked about (L5). stop is never taken as an answer.
- A plain-language reply to a restatement is read by GoAheadReader, one
  model call that agrees only on a clear yes; questions never reach it. The
  agent says "taking that as a go-ahead on rev-N" first, bound to the
  revision on screen at arrival (L3, L5, D1).
- Labels steer (D1): `bug` goes ahead after tuning.loop.bug_grace_s
  (default 600 s) unless the operator replies; `discuss` isn't offered
  restate until the operator has spoken; `bug`, `discuss` and `design` add
  to the driver's instructions. A restatement asks no questions.

Tests: label and command unit tests, the property walk with labelled
issues, plain yeses, named gos and time passing (grace_only_unanswered,
discuss_talks_first), and e2e tests for a bug proceeding after its grace
period and a plain-language go-ahead.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PPQ14L3LikyefCMFBqEbKE

nisse-dev/src/nisse_dev/loop/build.py

@@ -19,6 +19,7 @@ from nisse_dev.gitea import GiteaClient
 from nisse_dev.loop.agent import LoopAgent
 from nisse_dev.loop.driver import Driver
 from nisse_dev.loop.milestones import Milestones
+from nisse_dev.loop.reader import GoAheadReader
 from nisse_dev.matrix import MatrixTransport
 from nisse_dev.oplog import OpLog
 from nisse_dev.state import StateStore
@@ -109,6 +110,10 @@ def build_loop_agent(config: AgentConfig) -> RunningLoop:
         cancel=cancel,
         oplog=oplog,
         roles=config.roles.pinned(),
+        # The driver's model reads plain-language go-aheads until the
+        # classifier role arrives (M2.6).
+        reader=GoAheadReader(normalized, config.roles.resolve("planner")),
+        bug_grace_s=config.tuning.loop.bug_grace_s,
         milestones=Milestones(
             store,
             git,