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-dev/tests/test_loop_labels.py

@@ -9,8 +9,8 @@ import pytest
 from test_loop import DON, RESTATED, FakeGitea, Harness, ScriptedModel, call, issue
 from test_loop import h as h  # noqa: PLC0414 -- the fixture
 
-from nisse_core.canonical import Fact, ToolCall
-from nisse_core.llm import LLMError
+from nisse_core.log.canonical import Fact, ToolCall
+from nisse_core.models.llm import LLMError
 from nisse_dev.loop.items import ANSWER, GO_AHEAD, READY, WAITING, loop_of
 from nisse_dev.loop.reader import GoAheadReader
 
@@ -284,7 +284,7 @@ def test_an_unlabelled_issue_waits_for_go_with_no_countdown(h: Harness) -> None:
 
 
 def _msg(text: str, thread: str) -> Any:
-    from nisse_core.transport import InboundMessage
+    from nisse_core.conversation.transport import InboundMessage
 
     return InboundMessage(DON, text, thread=thread)