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/entities.py

@@ -2,7 +2,7 @@
 
 These are notes with a non-'note' note_type and type-specific JSON metadata
 stored in the entity_meta column. Three tools per type — list, create, update.
-For get and delete, use fable_get_note / fable_delete_note (typed entities
+For get and delete, use get_note / delete_note (typed entities
 share the Note model).
 
 The wrappers translate typed-field kwargs into the entity_meta dict shape that
@@ -72,7 +72,7 @@ _PERSON_FIELDS = ("relationship", "email", "phone", "birthday",
                   "organization", "address")
 
 
-async def fable_list_persons(q: str = "", tag: str = "", limit: int = 25) -> dict:
+async def list_persons(q: str = "", tag: str = "", limit: int = 25) -> dict:
     """List people in the user's knowledge base.
 
     Args:
@@ -83,7 +83,7 @@ async def fable_list_persons(q: str = "", tag: str = "", limit: int = 25) -> dic
     return await _list_by_type("person", q, tag, limit)
 
 
-async def fable_create_person(
+async def create_person(
     name: str,
     relationship: str = "",
     email: str = "",
@@ -109,7 +109,7 @@ async def fable_create_person(
     return await _create_entity("person", name, meta, tags)
 
 
-async def fable_update_person(
+async def update_person(
     person_id: int,
     name: str = "",
     relationship: str = "",
@@ -135,12 +135,12 @@ async def fable_update_person(
 # ─── Place ───────────────────────────────────────────────────────────────────
 
 
-async def fable_list_places(q: str = "", tag: str = "", limit: int = 25) -> dict:
+async def list_places(q: str = "", tag: str = "", limit: int = 25) -> dict:
     """List places (cafes, offices, addresses) in the user's knowledge base."""
     return await _list_by_type("place", q, tag, limit)
 
 
-async def fable_create_place(
+async def create_place(
     name: str,
     address: str = "",
     phone: str = "",
@@ -163,7 +163,7 @@ async def fable_create_place(
     return await _create_entity("place", name, meta, tags)
 
 
-async def fable_update_place(
+async def update_place(
     place_id: int,
     name: str = "",
     address: str = "",
@@ -183,12 +183,12 @@ async def fable_update_place(
 # ─── List ────────────────────────────────────────────────────────────────────
 
 
-async def fable_list_lists(q: str = "", tag: str = "", limit: int = 25) -> dict:
+async def list_lists(q: str = "", tag: str = "", limit: int = 25) -> dict:
     """List checklists in the user's knowledge base."""
     return await _list_by_type("list", q, tag, limit)
 
 
-async def fable_create_list(
+async def create_list(
     name: str,
     category: str = "",
     items: list[str] | None = None,
@@ -210,7 +210,7 @@ async def fable_create_list(
     return await _create_entity("list", name, meta, tags)
 
 
-async def fable_update_list(
+async def update_list(
     list_id: int,
     name: str = "",
     category: str = "",
@@ -238,8 +238,8 @@ async def fable_update_list(
 
 def register(mcp) -> None:
     for fn in (
-        fable_list_persons, fable_create_person, fable_update_person,
-        fable_list_places, fable_create_place, fable_update_place,
-        fable_list_lists, fable_create_list, fable_update_list,
+        list_persons, create_person, update_person,
+        list_places, create_place, update_place,
+        list_lists, create_list, update_list,
     ):
         mcp.tool(name=fn.__name__)(fn)