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/architecture.md

@@ -20,7 +20,7 @@
 │              Docker Compose                  │
 │                                              │
 │  ┌──────────────────────┐   ┌────────────┐  │
-│  │  fabledassistant     │   │  ollama    │  │
+│  │  scribe     │   │  ollama    │  │
 │  │  ┌────────────────┐  │   │            │  │
 │  │  │  Quart Server  │  │   │  LLM API   │  │
 │  │  │  ┌──────────┐  │  │   │            │  │
@@ -43,7 +43,7 @@
 ## Project Structure
 
 ```
-fabledassistant/
+scribe/
 ├── docker-compose.yml           # Development stack
 ├── docker-compose.prod.yml      # Production stack (Docker Swarm)
 ├── Dockerfile                   # Multi-stage build (Node → Python)
@@ -54,7 +54,7 @@ fabledassistant/
 │       ├── server.py            # FastMCP tool registrations
 │       ├── client.py            # FableClient (httpx wrapper)
 │       └── tools/               # Tool modules (notes, tasks, projects, …)
-├── src/fabledassistant/
+├── src/scribe/
 │   ├── app.py                   # Quart app factory + blueprint registration
 │   ├── config.py                # Config class (reads env vars)
 │   ├── auth.py                  # login_required decorator, session checks
@@ -169,7 +169,7 @@ Permission resolution is centralised in `services/access.py`. `get_project_permi
 
 ## Detailed File Reference
 
-### Backend (`src/fabledassistant/`)
+### Backend (`src/scribe/`)
 
 | File | Responsibility |
 |------|---------------|