refactor(db): split import_economics.py; single generator-source registry (T-1067)

import_economics.py 2,620 → 309 lines — a thin orchestrator keeping the
exact CLI, single-transaction/rollback contract, and exit codes. The 16
import steps, MIGRATION_SQL, brands shell-out, validators, and stamp
write now live in tooling/economy-db/economy_import/ (db, migration,
economy, corporations, brands, bodies, atlas, specialization, traits,
validators, stamp, paths, errors). Full type hints throughout.

tooling/generator_sources.py replaces the triplicated source registry
(importer / stamp checker / pr-process watch list — the skill now derives
its list via --list). The registry stamps itself, and economy_import/
modules are globbed fail-closed, so a future module is stamped the moment
it exists — closing the silently-weakened-stamp failure mode.

Rider: connector config helpers centralized in tooling/db/common.py.

Byte-identical behavior proven: full-import table dump diff EMPTY over
107,843 lines / 37 tables (volatile timestamp fields excluded); dry-run
output parity; generated_brands.toml sha unchanged. make test-tooling
PASS; ruff clean.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

tooling/db/audio_connector.py

@@ -15,7 +15,7 @@ from pathlib import Path
 
 sys.path.insert(0, str(Path(__file__).resolve().parent))
 
-from common import ensure_venv  # noqa: E402
+from common import ensure_venv, get_base_url as _get_base_url  # noqa: E402
 
 ensure_venv()
 
@@ -27,15 +27,9 @@ import time
 import urllib.error
 import urllib.request
 
-CONFIG_PATH = os.path.join(os.path.dirname(__file__), "config.json")
 
-def load_config():
-    with open(CONFIG_PATH) as f:
-        return json.load(f)
-
-def get_base_url():
-    config = load_config()
-    return config.get("stable_audio_url", "http://tower-of-joy:11500")
+def get_base_url() -> str:
+    return _get_base_url("stable_audio_url", "http://tower-of-joy:11500")
 
 def health():
     """Check if the Stable Audio API is reachable."""