Adding New Document Download Links

Filing download buttons in the Filings overlay are driven by filings_sources in Explorer's manifest.json. Each source maps a document type to a Python fetcher module.

Manifest entry

Each source defines:

Field	Purpose
`label`	Button text in the Filings overlay
`filing_type`	Cache key and document classification
`cache_policy`	How long blobs are retained (`forever`, `edgar_hybrid`, …)
`trigger`	XPath-style path match (e.g. `\.US/filings$`)
`module`	Python module path under `apps.explorer.sources`

Fetcher module

Implement a fetcher that returns filing metadata and file paths. Place it under fire-app-apps/explorer/sources/<market>/. The explorer service discovers sources at startup from the manifest.

Testing

Add the manifest entry and fetcher module.
Restart the backend (or reload Explorer).
Open a matching stock's Filings overlay — the new button should appear.
Run a fetch and confirm files land under filings/ with expected names.