Fix bd-143: Prevent daemon auto-sync from wiping out issues.jsonl with empty database

- Added safety check to exportToJSONLWithStore (daemon path)
- Refuses to export 0 issues over non-empty JSONL file
- Added --force flag to override safety check when intentional
- Added test coverage for empty database export protection
- Prevents data loss when daemon has wrong/empty database

Amp-Thread-ID: https://ampcode.com/threads/T-de18e0ad-bd17-46ec-994b-0581e257dcde
Co-authored-by: Amp <amp@ampcode.com>

integrations/beads-mcp/uv.lock

@@ -58,7 +58,7 @@ wheels = [
 
 [[package]]
 name = "beads-mcp"
-version = "0.14.0"
+version = "0.17.0"
 source = { editable = "." }
 dependencies = [
     { name = "fastmcp" },