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>

docs/configuration.md

@@ -8,7 +8,7 @@ Configuration is via environment variables. The `docker-compose.yml` file sets d
 
 | Variable | Default | Description |
 |----------|---------|-------------|
-| `DATABASE_URL` | `postgresql+asyncpg://fabled:fabled@db/fabledassistant` | PostgreSQL async connection string |
+| `DATABASE_URL` | `postgresql+asyncpg://fabled:fabled@db/scribe` | PostgreSQL async connection string |
 | `SECRET_KEY` | `dev-secret-change-me` | Session signing key — **change this in production** |
 | `SECRET_KEY_FILE` | — | Path to a Docker secret file containing the key (alternative to `SECRET_KEY`) |
 | `LOG_LEVEL` | `INFO` | Logging verbosity (`DEBUG`, `INFO`, `WARNING`, `ERROR`) |
@@ -91,7 +91,7 @@ The production compose file adds:
 ```bash
 # Create Docker secrets
 echo "$(python3 -c 'import secrets; print(secrets.token_hex(32))')" | docker secret create fabled_secret_key -
-echo "postgresql+asyncpg://fabled:strongpassword@db/fabledassistant" | docker secret create fabled_db_url -
+echo "postgresql+asyncpg://fabled:strongpassword@db/scribe" | docker secret create fabled_db_url -
 
 # Deploy
 docker stack deploy -c docker-compose.prod.yml fabled