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_routes_rulebooks.py

@@ -48,6 +48,8 @@ def test_service_signatures_require_user_id():
         "list_rules", "list_always_on_rules",
         "get_rule", "update_rule", "delete_rule",
         "subscribe_project", "unsubscribe_project", "get_applicable_rules",
+        "suppress_rule_for_project", "unsuppress_rule_for_project",
+        "suppress_topic_for_project", "unsuppress_topic_for_project",
     ):
         sig = inspect.signature(getattr(svc, fn_name))
         assert "user_id" in sig.parameters, f"{fn_name} missing user_id param"
@@ -67,6 +69,29 @@ def test_create_project_rule_route_exists():
     assert callable(getattr(rb_routes, "create_project_rule"))
 
 
+def test_suppression_route_handlers_exist():
+    """The 4 suppression endpoint handlers are registered as Python callables."""
+    from fabledassistant.routes import rulebooks as rb_routes
+    for name in (
+        "suppress_project_rule", "unsuppress_project_rule",
+        "suppress_project_topic", "unsuppress_project_topic",
+    ):
+        assert callable(getattr(rb_routes, name)), f"missing route handler: {name}"
+
+
+def test_suppression_association_tables_declared():
+    """Migration 0060 created two new association tables; the models module
+    must declare matching Table() objects so the rest of the service layer
+    can reference them via .c.<column>."""
+    from fabledassistant.models import rulebook as rb_models
+    for tbl_name in ("project_rule_suppressions", "project_topic_suppressions"):
+        tbl = getattr(rb_models, tbl_name, None)
+        assert tbl is not None, f"models.rulebook missing {tbl_name}"
+        cols = {c.name for c in tbl.columns}
+        assert "project_id" in cols
+        assert "rule_id" in cols or "topic_id" in cols
+
+
 def test_rulebook_model_carries_always_on():
     """Migration 0058 added rulebooks.always_on — verify the model declares it."""
     from fabledassistant.models.rulebook import Rulebook