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_toolchain.py

@@ -26,13 +26,13 @@ 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_core.cancel import Cancel
-from nisse_core.canonical import Fact, ToolResult
-from nisse_core.execution import HostKeyChanged
+from nisse_core.conversation.transport import InMemoryTransport
+from nisse_core.execution.ssh import HostKeyChanged
 from nisse_core.gitea import Issue
+from nisse_core.log.canonical import Fact, ToolResult
 from nisse_core.oplog import OpLog
-from nisse_core.transport import InMemoryTransport
-from nisse_core.worker import InlineWorker
+from nisse_core.state.cancel import Cancel
+from nisse_core.state.worker import InlineWorker
 from nisse_dev.loop import preflight
 from nisse_dev.loop.agent import LoopAgent, Project
 from nisse_dev.loop.driver import Driver
@@ -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_core.canonical import AssistantText
+    from nisse_core.log.canonical import AssistantText
 
     prose = [AssistantText(text="hmm", model="m")]
     model = ScriptedModel(prose, prose, RESTATE)