feat(rules)!: retire rulebook subscriptions and per-project suppressions (#4052)

A rule's home is its scope now: a rule in a rulebook topic is global, a rule on
a project applies to that project, and retrieval reads that directly (#4074).
A subscription had stopped changing anything a session received; a suppression
muted rules from a subscription. Operator, 2026-09-15: "we have global and
project scoped rules, we don't need the subscriptions now."

What goes, whole (rule 22):
- Migration 0101 drops project_rulebook_subscriptions, project_rule_suppressions
  and project_topic_suppressions, and strips subscribe_rulebooks (and 394's
  leftover exclude_always_on_rulebooks) from stored inception choices.
- Service, MCP and REST: subscribe/unsubscribe and the four suppress/unsuppress
  operations. The Subscribers checklist, the subscribe chips, the skip buttons
  and the Suppressed section in the rules UI.
- Inception asks two questions (design system, seed Systems). create_project and
  decide_project_inception lose subscribe_rulebooks.
- Backup v15 stops exporting the three sections; older archives still restore,
  the keys simply unread. Trash no longer hard-deletes suppression rows.

What changes meaning:
- get_applicable_rules is a project's LISTING: its own rules, plus the global
  rules tagged to an area it works in. Untagged global rules apply everywhere
  and arrive by retrieval, so they are not listed. A co_surfaces partner on a
  different project is not dragged in.
- list_rules(project_id) lists that project's own rules.
- rules_payload drops subscribed_rulebooks and suppressed_*; the handshake's
  brief form is project_rules alone.
- using-scribe's "Where a new rule goes" and inception sections, tool
  docstrings and docs say global vs project. Plugin 2026.09.15.1620.

Milestone 414 step 2.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01821k5B3Ysecp9fNYs92Kuy

tests/test_mcp_tool_rulebooks.py

@@ -186,30 +186,6 @@ async def test_delete_rule_with_confirmed_soft_deletes():
     assert mock_delete.called
 
 
-@pytest.mark.asyncio
-async def test_subscribe_project_to_rulebook_calls_service():
-    mock = AsyncMock()
-    with patch(
-        "scribe.mcp.tools.rulebooks.rulebooks_svc.subscribe_project", mock,
-    ):
-        from scribe.mcp.tools.rulebooks import subscribe_project_to_rulebook
-        out = await subscribe_project_to_rulebook(project_id=3, rulebook_id=1)
-    assert out["subscribed"] is True
-    assert mock.called
-
-
-@pytest.mark.asyncio
-async def test_unsubscribe_project_from_rulebook_calls_service():
-    mock = AsyncMock()
-    with patch(
-        "scribe.mcp.tools.rulebooks.rulebooks_svc.unsubscribe_project", mock,
-    ):
-        from scribe.mcp.tools.rulebooks import unsubscribe_project_from_rulebook
-        out = await unsubscribe_project_from_rulebook(project_id=3, rulebook_id=1)
-    assert out["subscribed"] is False
-    assert mock.called
-
-
 def test_register_attaches_every_tool():
     """Every tool in the module reaches the server.
 
@@ -227,7 +203,9 @@ def test_register_attaches_every_tool():
     # (milestone 399).
     # 28 since milestone 394 took list_always_on_rules and the two
     # always-on exclusion tools with the tier they served.
-    assert len(mcp.names) == 28
+    # 22 since milestone 414 retired subscriptions and suppressions: the two
+    # subscribe tools and the four suppress/unsuppress tools.
+    assert len(mcp.names) == 22
     # spot-check a few names
     assert "list_rulebooks" in mcp.names
     assert "create_rule" in mcp.names
@@ -237,17 +215,17 @@ def test_register_attaches_every_tool():
     # get_preference to look for here.
     assert "create_preference" in mcp.names
     assert "update_preference" in mcp.names
-    assert "subscribe_project_to_rulebook" in mcp.names
     assert "create_project_rule" in mcp.names
-    assert "suppress_rule_for_project" in mcp.names
     # milestone 312: the sweep, and the stamp that answers it
     assert "rules_due_for_verification" in mcp.names
     assert "mark_rule_verified" in mcp.names
     # milestone 323: what a rule used to say
     assert "rule_history" in mcp.names
-    assert "unsuppress_rule_for_project" in mcp.names
-    assert "suppress_topic_for_project" in mcp.names
-    assert "unsuppress_topic_for_project" in mcp.names
+    # milestone 414: a rule's home is its scope; nothing subscribes or mutes.
+    for gone in ("subscribe_project_to_rulebook", "unsubscribe_project_from_rulebook",
+                 "suppress_rule_for_project", "unsuppress_rule_for_project",
+                 "suppress_topic_for_project", "unsuppress_topic_for_project"):
+        assert gone not in mcp.names
 
 
 
@@ -306,50 +284,6 @@ async def test_create_project_rule_uses_explicit_title_when_given():
     assert kwargs["title"] == "no auto-docstrings"
 
 
-@pytest.mark.asyncio
-async def test_suppress_rule_for_project_passes_through():
-    mock = AsyncMock(return_value=None)
-    with patch("scribe.mcp.tools.rulebooks.rulebooks_svc.suppress_rule_for_project", mock):
-        from scribe.mcp.tools.rulebooks import suppress_rule_for_project
-        out = await suppress_rule_for_project(project_id=3, rule_id=17)
-    kwargs = mock.call_args.kwargs
-    assert kwargs == {"project_id": 3, "rule_id": 17, "user_id": 7}
-    assert out == {"project_id": 3, "rule_id": 17, "suppressed": True}
-
-
-@pytest.mark.asyncio
-async def test_unsuppress_rule_for_project_passes_through():
-    mock = AsyncMock(return_value=None)
-    with patch("scribe.mcp.tools.rulebooks.rulebooks_svc.unsuppress_rule_for_project", mock):
-        from scribe.mcp.tools.rulebooks import unsuppress_rule_for_project
-        out = await unsuppress_rule_for_project(project_id=3, rule_id=17)
-    kwargs = mock.call_args.kwargs
-    assert kwargs == {"project_id": 3, "rule_id": 17, "user_id": 7}
-    assert out == {"project_id": 3, "rule_id": 17, "suppressed": False}
-
-
-@pytest.mark.asyncio
-async def test_suppress_topic_for_project_passes_through():
-    mock = AsyncMock(return_value=None)
-    with patch("scribe.mcp.tools.rulebooks.rulebooks_svc.suppress_topic_for_project", mock):
-        from scribe.mcp.tools.rulebooks import suppress_topic_for_project
-        out = await suppress_topic_for_project(project_id=3, topic_id=22)
-    kwargs = mock.call_args.kwargs
-    assert kwargs == {"project_id": 3, "topic_id": 22, "user_id": 7}
-    assert out == {"project_id": 3, "topic_id": 22, "suppressed": True}
-
-
-@pytest.mark.asyncio
-async def test_unsuppress_topic_for_project_passes_through():
-    mock = AsyncMock(return_value=None)
-    with patch("scribe.mcp.tools.rulebooks.rulebooks_svc.unsuppress_topic_for_project", mock):
-        from scribe.mcp.tools.rulebooks import unsuppress_topic_for_project
-        out = await unsuppress_topic_for_project(project_id=3, topic_id=22)
-    kwargs = mock.call_args.kwargs
-    assert kwargs == {"project_id": 3, "topic_id": 22, "user_id": 7}
-    assert out == {"project_id": 3, "topic_id": 22, "suppressed": False}
-
-
 # ── Typed edges between rules (milestone 307) ───────────────────────────
 
 @pytest.mark.asyncio