refactor(mcp): drop fable_ prefix from tool names; rebrand to Scribe

MCP clients see tools namespaced by the server's local name already
(mcp__<server>__<tool>), so the fable_ prefix on every tool name was
redundant and ate tokens in the model's tool list.

Tools renamed (34 total):
  fable_search → search
  fable_list_notes / get_note / create_note / update_note / delete_note → list_notes / ...
  fable_list_tasks / get_task / create_task / update_task / add_task_log → list_tasks / ...
  fable_list_projects / get_project / create_project / update_project → list_projects / ...
  fable_list_milestones / create_milestone / update_milestone → list_milestones / ...
  fable_list_events / create_event / get_event / update_event / delete_event → list_events / ...
  fable_list_tags → list_tags
  fable_get_recent → get_recent
  fable_list_persons / create_person / update_person → list_persons / ...
  fable_list_places / create_place / update_place → list_places / ...
  fable_list_lists / create_list / update_list → list_lists / ...

Also rebranded in MCP scope:
  FastMCP("fable", ...) → FastMCP("scribe", ...)
  auth realm "fable-mcp" → "scribe-mcp"
  ASGI scope key fable_user_id → scribe_user_id
  ContextVar label fable_mcp_user_id → scribe_mcp_user_id
  Tool docstrings "in Fable" / "Fable task" → "in Scribe" / "Scribe task"
  Server _INSTRUCTIONS prose

Deliberately kept:
  - The internal Python package name `fabledassistant` (per project naming
    convention — internal stays).
  - "Fabled Scribe" as the official product/brand name (page footer,
    smtp_from_name default).
  - References to the legacy `fable-mcp/` standalone package in docstrings
    explaining what we ported from — accurate until that directory is
    deleted in Phase 10.

Client impact: existing MCP registrations need
  claude mcp remove <name> && claude mcp add ...
once with a freshly-copied snippet from Settings → MCP Access. Claude
Code then re-discovers tools on connect — old conversations that
referenced fable_* tool names will see "tool not found" on those calls
until updated.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/fabledassistant/mcp/tools/notes.py

@@ -17,18 +17,18 @@ from fabledassistant.mcp._context import current_user_id
 from fabledassistant.services import notes as notes_svc
 
 
-async def fable_list_notes(
+async def list_notes(
     limit: int = 20,
     offset: int = 0,
     tag: str = "",
     search_text: str = "",
 ) -> dict:
-    """List notes (non-task documents) stored in Fable.
+    """List notes (non-task documents) stored in Scribe.
 
     Optionally filter by a single tag (plain string, no # prefix) or a keyword
     search against title and body. Results are ordered by last-updated descending.
 
-    Use fable_search for semantic/meaning-based lookup instead of exact keyword search.
+    Use search for semantic/meaning-based lookup instead of exact keyword search.
     """
     uid = current_user_id()
     rows, total = await notes_svc.list_notes(
@@ -42,8 +42,8 @@ async def fable_list_notes(
     return {"notes": [n.to_dict() for n in rows], "total": total}
 
 
-async def fable_get_note(note_id: int) -> dict:
-    """Fetch the full content of a single Fable note by its ID.
+async def get_note(note_id: int) -> dict:
+    """Fetch the full content of a single Scribe note by its ID.
 
     Returns id, title, body (markdown), tags, project_id, created_at, updated_at.
     """
@@ -54,13 +54,13 @@ async def fable_get_note(note_id: int) -> dict:
     return note.to_dict()
 
 
-async def fable_create_note(
+async def create_note(
     title: str,
     body: str = "",
     tags: list[str] | None = None,
     project_id: int = 0,
 ) -> dict:
-    """Create a new note in Fable.
+    """Create a new note in Scribe.
 
     Args:
         title: Note title (required).
@@ -81,14 +81,14 @@ async def fable_create_note(
     return note.to_dict()
 
 
-async def fable_update_note(
+async def update_note(
     note_id: int,
     title: str = "",
     body: str = "",
     tags: list[str] | None = None,
     project_id: int = 0,
 ) -> dict:
-    """Update an existing Fable note. Only explicitly provided fields are changed.
+    """Update an existing Scribe note. Only explicitly provided fields are changed.
 
     Args:
         note_id: ID of the note to update.
@@ -113,8 +113,8 @@ async def fable_update_note(
     return note.to_dict()
 
 
-async def fable_delete_note(note_id: int) -> str:
-    """Permanently delete a Fable note by ID. This cannot be undone."""
+async def delete_note(note_id: int) -> str:
+    """Permanently delete a Scribe note by ID. This cannot be undone."""
     uid = current_user_id()
     deleted = await notes_svc.delete_note(uid, note_id)
     if not deleted:
@@ -124,10 +124,10 @@ async def fable_delete_note(note_id: int) -> str:
 
 def register(mcp) -> None:
     for fn in (
-        fable_list_notes,
-        fable_get_note,
-        fable_create_note,
-        fable_update_note,
-        fable_delete_note,
+        list_notes,
+        get_note,
+        create_note,
+        update_note,
+        delete_note,
     ):
         mcp.tool(name=fn.__name__)(fn)