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.py

@@ -8,19 +8,19 @@ from typing import Any
 import pytest
 from model_contract import assert_renderable
 
-from nisse_core.cancel import Cancel
-from nisse_core.canonical import (
+from nisse_core.conversation.transport import InMemoryTransport
+from nisse_core.gitea import Issue
+from nisse_core.log.canonical import (
     AssistantText,
     CanonicalEvent,
     Fact,
     ToolCall,
     ToolResult,
 )
-from nisse_core.gitea import Issue
-from nisse_core.llm import LLMError
+from nisse_core.models.llm import LLMError
 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.agent import LoopAgent
 from nisse_dev.loop.driver import Driver
 from nisse_dev.loop.items import CLOSED, GO_AHEAD, READY, RUNNING, WAITING, loop_of
@@ -250,7 +250,7 @@ def test_a_go_for_an_earlier_revision_is_not_applied(h: Harness) -> None:
     h.say("put it in its own module")  # changes, so the driver restates rev-2
     assert loop_of(h.item()).rev == 2
     # A go sent while rev-1 was on screen, arriving now.
-    from nisse_core.transport import InboundMessage
+    from nisse_core.conversation.transport import InboundMessage
 
     h.agent.handle(InboundMessage(DON, "go", thread=h.thread()), about=1)
     assert not loop_of(h.item()).started