nisse-core: group modules into packages by architecture section

A pure move; behaviour unchanged.

- models (L9, L7): llm, catalog, probe, render, render_anthropic, context
- log (L7, L6): canonical, views
- state (L8): store (was state), reconcile, worker, cancel, dump
- knowledge (L10, L6.4): vault, memory
- conversation (L5): transport, matrix
- execution (L13): ssh (was execution), testing
- authority (P3, P4, L4): actions
- gitea, oplog, envfile stay at the top until each gains a second module.

Every import, monkeypatch target, script and doc reference rewritten.

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

nisse-core/src/nisse_core/gitea.py

@@ -16,8 +16,8 @@ from typing import Any
 
 import httpx
 
-from nisse_core.reconcile import Reconciler
-from nisse_core.state import Intent
+from nisse_core.state.reconcile import Reconciler
+from nisse_core.state.store import Intent
 
 PR_PAGE_SIZE = 50
 MAX_PR_PAGES = 40  # 2000 PRs; beyond that, say so rather than guess