feat(rules): project rule + topic suppressions

Lets a project mute individual rules or whole topics from rulebooks it
subscribes to, without unsubscribing the rulebook. Two new association
tables (migration 0060), 4 MCP tools (suppress/unsuppress × rule/topic),
4 REST endpoints, and an inline "× skip" affordance plus collapsed
"Suppressed (N)" section in the project's Rules tab.

get_applicable_rules now emits suppressed_rules and suppressed_topics
(detail objects with rulebook/topic context, not just IDs) so the UI
can render the suppressed list without a follow-up lookup. The main
rules projection grew topic_id and rulebook_id columns for the per-row
suppress affordance.

Project deletion cascades the suppression rows via hard DELETE — they
are pure associations with no soft-delete column, and restoring a
deleted project should start fresh, not inherit stale mutes.

Project-scoped rules (Rule.project_id) are deliberately not suppressible
— delete them with delete_rule instead.

Implements plan-task #187.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

tests/test_services_trash.py

@@ -48,18 +48,24 @@ async def test_delete_returns_none_when_not_found():
 
 
 @pytest.mark.asyncio
-async def test_delete_project_cascades_to_notes_milestones_and_project_rules():
+async def test_delete_project_cascades_to_notes_milestones_project_rules_and_suppressions():
     session = _make_mock_session()
-    # exists-check + 4 cascade updates (notes, milestones, project-scoped rules, project)
+    # exists-check + 6 cascade ops:
+    #   notes (soft) → milestones (soft) → project-scoped rules (soft) →
+    #   project_rule_suppressions (hard DELETE) → project_topic_suppressions (hard DELETE) →
+    #   project (soft)
     session.execute = AsyncMock(side_effect=[
-        _exists_result(True), MagicMock(), MagicMock(), MagicMock(), MagicMock(),
+        _exists_result(True),
+        MagicMock(), MagicMock(), MagicMock(),
+        MagicMock(), MagicMock(),
+        MagicMock(),
     ])
     with patch("fabledassistant.services.trash.async_session") as cls:
         cls.return_value = session
         from fabledassistant.services.trash import delete
         batch = await delete(user_id=1, entity_type="project", entity_id=3)
     assert isinstance(batch, str)
-    assert session.execute.await_count == 5
+    assert session.execute.await_count == 7
 
 
 @pytest.mark.asyncio