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/tests/test_loop_toolchain.py

@@ -26,18 +26,18 @@ from test_loop_milestones import (
 from test_loop_milestones import item as the_item
 from test_loop_milestones import world as world  # noqa: PLC0414 -- the fixture
 
-from nisse_dev.cancel import Cancel
-from nisse_dev.canonical import Fact, ToolResult
-from nisse_dev.execution import HostKeyChanged
-from nisse_dev.gitea import Issue
+from nisse_core.cancel import Cancel
+from nisse_core.canonical import Fact, ToolResult
+from nisse_core.execution import HostKeyChanged
+from nisse_core.gitea import Issue
+from nisse_core.oplog import OpLog
+from nisse_core.transport import InMemoryTransport
+from nisse_core.worker import InlineWorker
 from nisse_dev.loop import preflight
 from nisse_dev.loop.agent import LoopAgent, Project
 from nisse_dev.loop.driver import Driver
 from nisse_dev.loop.items import ANSWER, GO_AHEAD, WAITING, loop_of
-from nisse_dev.oplog import OpLog
 from nisse_dev.tools import Workspace
-from nisse_dev.transport import InMemoryTransport
-from nisse_dev.worker import InlineWorker
 
 PYTHON = {"name": "python", "version_command": "python3 --version"}
 
@@ -194,7 +194,7 @@ def test_what_was_installed_or_is_missing_is_said(
 def test_an_unfinished_step_is_said_and_work_goes_on(
     world: dict[str, Any], project: str
 ) -> None:
-    from nisse_dev.canonical import AssistantText
+    from nisse_core.canonical import AssistantText
 
     prose = [AssistantText(text="hmm", model="m")]
     model = ScriptedModel(prose, prose, RESTATE)