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>

docker-compose.prod.yml

@@ -2,13 +2,13 @@ services:
   app:
     image: git.fabledsword.com/bvandeusen/fabledscribe:latest
     environment:
-      DATABASE_URL: "postgresql+asyncpg://fabled:${DB_PASSWORD}@db:5432/fabledassistant"
+      DATABASE_URL: "postgresql+asyncpg://scribe:${DB_PASSWORD}@db:5432/scribe"
       SECRET_KEY: "${SECRET_KEY}"
       LOG_LEVEL: "${LOG_LEVEL:-INFO}"
       TRUST_PROXY_HEADERS: "true"
       SECURE_COOKIES: "true"
     networks:
-      - fabledassistant_backend
+      - scribe_backend
     healthcheck:
       test: ["CMD", "python", "-c", "import urllib.request; urllib.request.urlopen('http://localhost:5000/api/health')"]
       interval: 30s
@@ -26,16 +26,16 @@ services:
     volumes:
       - pgdata:/var/lib/postgresql/data
     environment:
-      POSTGRES_USER: fabled
+      POSTGRES_USER: scribe
       POSTGRES_PASSWORD: "${DB_PASSWORD}"
-      POSTGRES_DB: fabledassistant
+      POSTGRES_DB: scribe
     networks:
-      - fabledassistant_backend
+      - scribe_backend
     # Lenient by design: a transient host exec/healthcheck stall (incident:
     # runc setns failures -> "unhealthy" -> SIGKILL -> crash loop) must never
     # escalate to killing the DB. Health here only gates app startup order.
     healthcheck:
-      test: ["CMD-SHELL", "pg_isready -U fabled"]
+      test: ["CMD-SHELL", "pg_isready -U scribe"]
       interval: 30s
       timeout: 10s
       retries: 10
@@ -51,5 +51,5 @@ volumes:
   pgdata:
 
 networks:
-  fabledassistant_backend:
+  scribe_backend:
     driver: overlay