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_services_knowledge_counts.py

@@ -32,9 +32,9 @@ async def test_counts_include_process_in_facet_and_total():
         _scalar(1),  # tasks
         _scalar(0),  # plans
     ])
-    with patch("fabledassistant.services.knowledge.async_session") as cls:
+    with patch("scribe.services.knowledge.async_session") as cls:
         cls.return_value = session
-        from fabledassistant.services.knowledge import get_knowledge_counts
+        from scribe.services.knowledge import get_knowledge_counts
         counts = await get_knowledge_counts(user_id=1)
 
     assert counts["process"] == 2