feat(rulebook): augment get_project with applicable_rules + MCP instructions

src/fabledassistant/mcp/server.py

@@ -20,6 +20,16 @@ Hierarchy: Project -> Milestone -> Task/Note.
   unchanged on updates.
 - For optional integer FKs (project_id, milestone_id, parent_id), use 0 to mean
   "not set".
+
+Scribe maintains a Rulebook system (Rulebook -> Topic -> Rule). Rules carry
+an actionable statement plus optional Why and How-to-apply context. When you
+start work on a project, get_project(id) returns applicable_rules (the rules
+from rulebooks the project subscribes to) and subscribed_rulebooks. Consult
+these before making decisions about workflow, conventions, or scope. Full
+text (Why / How-to-apply) is available via get_rule(id). You may create new
+rules via create_rule when you notice a pattern worth codifying — coordinate
+with the operator on whether it belongs in an existing rulebook+topic or a
+new one.
 """
 
 

src/fabledassistant/mcp/tools/projects.py

@@ -19,6 +19,7 @@ from __future__ import annotations
 from fabledassistant.mcp._context import current_user_id
 from fabledassistant.services import milestones as milestones_svc
 from fabledassistant.services import projects as projects_svc
+from fabledassistant.services import rulebooks as rulebooks_svc
 
 
 async def list_projects() -> dict:
@@ -33,10 +34,11 @@ async def list_projects() -> dict:
 
 
 async def get_project(project_id: int) -> dict:
-    """Fetch a Scribe project by ID, including its milestone summary.
+    """Fetch a Scribe project by ID.
 
-    Returns full project fields plus a milestone_summary list with each
-    milestone's id, title, status, and task counts.
+    Returns full project fields, a milestone_summary list, and the
+    rulebook-applicable_rules / subscribed_rulebooks pair the assistant
+    should consult when working on this project.
     """
     uid = current_user_id()
     project = await projects_svc.get_project(uid, project_id)
@@ -46,6 +48,12 @@ async def get_project(project_id: int) -> dict:
     data["milestone_summary"] = await milestones_svc.get_project_milestone_summary(
         uid, project_id,
     )
+    applicable = await rulebooks_svc.get_applicable_rules(
+        project_id=project_id, user_id=uid,
+    )
+    data["applicable_rules"] = applicable["rules"]
+    data["applicable_rules_truncated"] = applicable["truncated"]
+    data["subscribed_rulebooks"] = applicable["subscribed_rulebooks"]
     return data