M7.1: extract nisse-core

What isn't the dev agent's moves to nisse-core, unchanged in behaviour,
with its tests: canonical, render, render_anthropic, llm, catalog, probe,
context, views, state, reconcile, worker, cancel, dump, transport, matrix,
execution, testing, vault, memory, oplog, envfile and gitea (whole).

- nisse_core.state.StateStore holds the tables every agent has; an
  agent's subclass adds its tables (version, migrations), roles and
  views. nisse_dev.state.StateStore adds the build VM blocks (v5).
- views.project takes what each role is shown, rather than a fixed table.
- Vault takes the agent's name (agent=), for provenance.
- A test that nisse_core never imports an agent.
- The loop, config, git, delegation, expert, tools and evals stay in
  nisse-dev until nisse-ops has a loop to share.

Docs: the Development Plan marks M7.1 done and notes that Phase 6 waits on
the agent host and Terraform; Architecture Part L names the package.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01J5Utyfzw7gF7UhjRDEtjTk

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

@@ -34,8 +34,8 @@ from nisse_core.actions import (
     Action,
     Verdict,
 )
-from nisse_dev.cancel import Cancel
-from nisse_dev.canonical import (
+from nisse_core.cancel import Cancel
+from nisse_core.canonical import (
     ActionVerdict,
     DelegationCompleted,
     DelegationStarted,
@@ -46,13 +46,19 @@ from nisse_dev.canonical import (
     ToolResult,
     UserMessage,
 )
+from nisse_core.execution import HostKeyChanged, HostUnavailable
+from nisse_core.gitea import GiteaClient, GiteaError, Issue, PullRequest
+from nisse_core.llm import LLMError, RoleMap
+from nisse_core.memory import Memory
+from nisse_core.oplog import OpLog
+from nisse_core.state import WorkItem
+from nisse_core.transport import InboundMessage, Transport
+from nisse_core.vault import Vault, VaultError
+from nisse_core.worker import Worker
 from nisse_dev.config import GENERAL
 from nisse_dev.delegation import DELEGATION_INTENT, Delegation
-from nisse_dev.execution import HostKeyChanged, HostUnavailable
 from nisse_dev.expert import BudgetExhausted, ExpertDesk
 from nisse_dev.git import GitError
-from nisse_dev.gitea import GiteaClient, GiteaError, Issue, PullRequest
-from nisse_dev.llm import LLMError, RoleMap
 from nisse_dev.loop import preflight
 from nisse_dev.loop.actions import classify, commits
 from nisse_dev.loop.classifier import IN_SCOPE, ActionClassifier, Scope
@@ -99,13 +105,8 @@ from nisse_dev.loop.tools import (
     TOOLCHAIN_STEP,
     WAIT_FOR_REVIEW,
 )
-from nisse_dev.memory import Memory
-from nisse_dev.oplog import OpLog
-from nisse_dev.state import StateStore, WorkItem
+from nisse_dev.state import StateStore
 from nisse_dev.tools import EXECUTION_TOOLS, Workspace
-from nisse_dev.transport import InboundMessage, Transport
-from nisse_dev.vault import Vault, VaultError
-from nisse_dev.worker import Worker
 
 INTAKE_INTERVAL_S = 30.0
 _GO = frozenset({"go", "approve"})