refactor: rename package fabledassistant -> scribe (code-only)

Renames src/fabledassistant -> src/scribe and all imports, plus the
default DB name and DB user/password (fabled -> scribe) in config +
compose. 952 refs / 154 files. Reverses the old 'internal name stays
fabledassistant' convention.

Code-only: live databases are still physically named 'fabledassistant'.
Deployed environments must set POSTGRES_DB / POSTGRES_USER (or rename the
DB) since the defaults now resolve to 'scribe'. Repo (FabledScribe), git
host (fabledsword), MCP (fabled-git) and the image name (fabledscribe)
are intentionally unchanged.

ruff check src/ clean locally; CI (typecheck + pytest) is the gate.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

tests/test_version_pinning_prune.py

@@ -32,10 +32,10 @@ async def test_create_version_prune_sql_filters_to_unpinned():
     mock_session.execute = AsyncMock(side_effect=execute_capture)
 
     with patch(
-        "fabledassistant.services.note_versions.async_session",
+        "scribe.services.note_versions.async_session",
         return_value=mock_session,
     ):
-        from fabledassistant.services.note_versions import create_version
+        from scribe.services.note_versions import create_version
         await create_version(
             user_id=1, note_id=42, body="content", title="t", tags=["a"],
         )
@@ -67,10 +67,10 @@ async def test_prune_auto_pins_filters_to_auto_kind():
     mock_session.execute = AsyncMock(side_effect=execute_capture)
 
     with patch(
-        "fabledassistant.services.version_pinning.async_session",
+        "scribe.services.version_pinning.async_session",
         return_value=mock_session,
     ):
-        from fabledassistant.services.version_pinning import (
+        from scribe.services.version_pinning import (
             prune_auto_pins, MAX_AUTO_PINS,
         )
         await prune_auto_pins(user_id=1, note_id=42)