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/tasks.py

@@ -3,9 +3,9 @@
 Tasks are notes with a non-null `status` — same model, different filter.
 Wrappers call services/notes.py for CRUD with is_task=True and add the
 task-specific fields (status, priority, due_date, parent_id), plus
-services/task_logs.py for fable_add_task_log.
+services/task_logs.py for add_task_log.
 
-There is no fable_delete_task — matches the existing fable-mcp surface.
+There is no delete_task — matches the existing fable-mcp surface.
 Cancel by updating status to "cancelled".
 
 Sentinels (preserved from existing fable-mcp):
@@ -23,13 +23,13 @@ from fabledassistant.services import notes as notes_svc
 from fabledassistant.services import task_logs as task_logs_svc
 
 
-async def fable_list_tasks(
+async def list_tasks(
     limit: int = 20,
     offset: int = 0,
     status: str = "",
     project_id: int = 0,
 ) -> dict:
-    """List tasks in Fable.
+    """List tasks in Scribe.
 
     Args:
         status: Filter by status — one of: todo, in_progress, done, cancelled. Omit for all.
@@ -49,8 +49,8 @@ async def fable_list_tasks(
     return {"tasks": [n.to_dict() for n in rows], "total": total}
 
 
-async def fable_get_task(task_id: int) -> dict:
-    """Fetch a single Fable task by ID.
+async def get_task(task_id: int) -> dict:
+    """Fetch a single Scribe task by ID.
 
     Returns id, title, body, status, priority, tags, project_id, milestone_id,
     parent_id, parent_title, due_date, created_at, updated_at.
@@ -69,7 +69,7 @@ async def fable_get_task(task_id: int) -> dict:
     return data
 
 
-async def fable_create_task(
+async def create_task(
     title: str,
     body: str = "",
     status: str = "todo",
@@ -79,7 +79,7 @@ async def fable_create_task(
     parent_id: int = 0,
     tags: list[str] | None = None,
 ) -> dict:
-    """Create a new task in Fable.
+    """Create a new task in Scribe.
 
     Args:
         title: Task title (required).
@@ -106,7 +106,7 @@ async def fable_create_task(
     return note.to_dict()
 
 
-async def fable_update_task(
+async def update_task(
     task_id: int,
     title: str = "",
     body: str = "",
@@ -115,7 +115,7 @@ async def fable_update_task(
     project_id: int = 0,
     milestone_id: int = 0,
 ) -> dict:
-    """Update an existing Fable task. Only explicitly provided fields are changed.
+    """Update an existing Scribe task. Only explicitly provided fields are changed.
 
     Args:
         task_id: ID of the task to update.
@@ -146,8 +146,8 @@ async def fable_update_task(
     return note.to_dict()
 
 
-async def fable_add_task_log(task_id: int, content: str) -> dict:
-    """Append a timestamped progress log entry to a Fable task.
+async def add_task_log(task_id: int, content: str) -> dict:
+    """Append a timestamped progress log entry to a Scribe task.
 
     Use this to record work sessions, decisions, or status updates over time
     without overwriting the task's main body. Each entry is stored separately
@@ -163,10 +163,10 @@ async def fable_add_task_log(task_id: int, content: str) -> dict:
 
 def register(mcp) -> None:
     for fn in (
-        fable_list_tasks,
-        fable_get_task,
-        fable_create_task,
-        fable_update_task,
-        fable_add_task_log,
+        list_tasks,
+        get_task,
+        create_task,
+        update_task,
+        add_task_log,
     ):
         mcp.tool(name=fn.__name__)(fn)