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_projects.py

@@ -73,7 +73,7 @@ async def test_get_project_enriches_with_milestone_summary():
     p = fake_project(id=5, title="found")
     milestone_summary = [{"id": 10, "title": "MS", "status": "active", "total": 3}]
     applicable_payload = {
-        "rules": [], "truncated": False, "subscribed_rulebooks": [],
+        "rules": [], "truncated": False,
     }
     with patch(
         "scribe.mcp.tools.projects.projects_svc.get_project",
@@ -91,9 +91,10 @@ async def test_get_project_enriches_with_milestone_summary():
 
 
 @pytest.mark.asyncio
-async def test_get_project_includes_applicable_rules_and_subscribed_rulebooks():
+async def test_get_project_includes_applicable_rules_and_project_rules():
     """The augmented get_project response includes applicable_rules and
-    subscribed_rulebooks pulled from services/rulebooks.get_applicable_rules.
+    project_rules pulled from services/rulebooks.get_applicable_rules, and
+    nothing about subscriptions (milestone 414).
     """
     p = fake_project(id=3, title="Fabled Assistant")
     milestone_summary = []
@@ -105,7 +106,6 @@ async def test_get_project_includes_applicable_rules_and_subscribed_rulebooks():
              "rulebook_title": "FabledSword family"},
         ],
         "truncated": False,
-        "subscribed_rulebooks": [{"id": 1, "title": "FabledSword family"}],
     }
     with patch(
         "scribe.mcp.tools.projects.projects_svc.get_project",
@@ -119,8 +119,10 @@ async def test_get_project_includes_applicable_rules_and_subscribed_rulebooks():
     ):
         out = await get_project(project_id=3)
     assert out["applicable_rules"][0]["title"] == "dev is home"
-    assert out["subscribed_rulebooks"] == [{"id": 1, "title": "FabledSword family"}]
+    assert out["project_rules"] == []
     assert out["applicable_rules_truncated"] is False
+    for gone in ("subscribed_rulebooks", "suppressed_rules", "suppressed_topics"):
+        assert gone not in out, gone
 
 
 @pytest.mark.asyncio
@@ -173,7 +175,6 @@ async def test_enter_project_composes_full_context():
                    "topic_title": "t", "rulebook_title": "rb"}],
         "project_rules": [{"id": 99, "title": "pr1", "statement": "ps"}],
         "truncated": False,
-        "subscribed_rulebooks": [{"id": 2, "title": "rb"}],
     }
     milestone_summary = [{"id": 10, "title": "MS", "status": "active", "total": 3}]
 
@@ -202,10 +203,9 @@ async def test_enter_project_composes_full_context():
     assert out["project"] == {"id": 5, "title": "P", "status": "active", "goal": ""}
     assert out["milestone_summary"] == milestone_summary
     # Rules arrive in full by retrieval; the handshake lists the project's own
-    # by id and title and drops the subscription bookkeeping (#4045).
+    # by id and title (#4045), and nothing about subscriptions (milestone 414).
     assert out["project_rules"] == [{"id": 99, "title": "pr1"}]
-    assert out["subscribed_rulebooks"] == [{"id": 2, "title": "rb"}]
-    for gone in ("applicable_rules", "applicable_rules_truncated",
+    for gone in ("applicable_rules", "applicable_rules_truncated", "subscribed_rulebooks",
                  "suppressed_rules", "suppressed_topics", "recent_notes"):
         assert gone not in out, gone
     assert out["open_tasks"] == [{
@@ -243,8 +243,7 @@ async def test_enter_project_surfaces_the_systems_vocabulary():
         AsyncMock(return_value=p),
     ), patch(
         "scribe.mcp.tools.projects.rulebooks_svc.get_applicable_rules",
-        AsyncMock(return_value={"rules": [], "truncated": False,
-                                "subscribed_rulebooks": []}),
+        AsyncMock(return_value={"rules": [], "truncated": False}),
     ), patch(
         "scribe.mcp.tools.projects.milestones_svc.get_project_milestone_summary",
         AsyncMock(return_value=[]),
@@ -266,8 +265,7 @@ def _enter_project_stubs(p):
         patch("scribe.mcp.tools.projects.projects_svc.get_project",
               AsyncMock(return_value=p)),
         patch("scribe.mcp.tools.projects.rulebooks_svc.get_applicable_rules",
-              AsyncMock(return_value={"rules": [], "truncated": False,
-                                      "subscribed_rulebooks": []})),
+              AsyncMock(return_value={"rules": [], "truncated": False})),
         patch("scribe.mcp.tools.projects.milestones_svc.get_project_milestone_summary",
               AsyncMock(return_value=[])),
         patch("scribe.mcp.tools.projects.notes_svc.list_notes",
@@ -357,8 +355,7 @@ async def test_enter_project_hands_back_the_design_system_when_the_project_has_o
         AsyncMock(return_value=p),
     ), patch(
         "scribe.mcp.tools.projects.rulebooks_svc.get_applicable_rules",
-        AsyncMock(return_value={"rules": [], "truncated": False,
-                                "subscribed_rulebooks": []}),
+        AsyncMock(return_value={"rules": [], "truncated": False}),
     ), patch(
         "scribe.mcp.tools.projects.milestones_svc.get_project_milestone_summary",
         AsyncMock(return_value=[]),
@@ -417,11 +414,10 @@ async def test_create_project_with_inception_args_decides_via_mcp():
     decided = {"inception": {"via": "mcp", "choices": {}}, "effects": {"systems_seeded": []}}
     with patch("scribe.mcp.tools.projects.projects_svc.create_project", AsyncMock(return_value=p)), \
          patch("scribe.mcp.tools.projects.inception_svc.decide", AsyncMock(return_value=decided)) as decide:
-        out = await create_project(title="P", subscribe_rulebooks=[1], design_system_id=-1, seed_systems=True)
+        out = await create_project(title="P", design_system_id=-1, seed_systems=True)
     kw = decide.await_args.kwargs
     assert decide.await_args.args[1] == 5 and kw["via"] == "mcp"
-    assert kw["choices"] == {"subscribe_rulebooks": [1],
-                             "design_system_id": None, "seed_systems": True}
+    assert kw["choices"] == {"design_system_id": None, "seed_systems": True}
     assert out["inception"]["via"] == "mcp" and "inception_effects" in out
 
 
@@ -437,8 +433,7 @@ async def test_decide_project_inception_tool_records_an_inherit_all_decision_whe
 
 @pytest.mark.asyncio
 async def test_enter_project_carries_the_inception_ask_only_for_an_undecided_own_project():
-    applicable = {"rules": [], "project_rules": [], "truncated": False,
-                  "subscribed_rulebooks": []}
+    applicable = {"rules": [], "project_rules": [], "truncated": False}
     ask = {"defaults": {}, "ask": "decide", "call": "decide_project_inception(...)"}
 
     async def run(project):
@@ -471,6 +466,8 @@ def test_inception_routes_and_tool_are_registered():
     mcp = build_mcp_server()
     assert mcp._tool_manager.get_tool("decide_project_inception") is not None
     tool = mcp._tool_manager.get_tool("create_project")
-    for name in ("subscribe_rulebooks", "design_system_id", "seed_systems"):
+    for name in ("design_system_id", "seed_systems"):
         assert name in tool.parameters.get("properties", {}), name
+    # Rules left inception with subscriptions (milestone 414).
+    assert "subscribe_rulebooks" not in tool.parameters.get("properties", {})