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_memory.py

@@ -12,17 +12,17 @@ from test_loop_milestones import item as the_item
 from test_loop_milestones import world as world  # noqa: PLC0414 -- the fixture
 from test_loop_notes import Spy
 
-from nisse_dev.canonical import AssistantText, Fact
-from nisse_dev.llm import RoleMap
-from nisse_dev.memory import Memory
-from nisse_dev.vault import Vault
+from nisse_core.canonical import AssistantText, Fact
+from nisse_core.llm import RoleMap
+from nisse_core.memory import Memory
+from nisse_core.vault import Vault
 
 FOLDER = "memory/nisse-dev"
 
 
 @pytest.fixture
 def memory(tmp_path: Path) -> Memory:
-    return Memory(Vault(tmp_path / "v", {FOLDER: "rw"}), FOLDER)
+    return Memory(Vault(tmp_path / "v", {FOLDER: "rw"}, agent="nisse-dev"), FOLDER)
 
 
 def facts(world: dict[str, Any]) -> list[str]: