Port from nanocoai/nanoclaw#2895's never-silently-drop guarantee.
Before: saveMedia() in scripts/whatsapp-bridge/bridge_helpers.js awaited
downloadMedia() with no try/catch. A failed CDN fetch (expired media URL,
transient network error — Baileys throws 'Failed to fetch stream from
https://mmg.whatsapp.net/...') rejected out of extractBridgeEvent, which
bridge.js awaits inside its messages.upsert for-loop with no per-message
guard — dropping the failed message AND every remaining message in the
same upsert batch, silently.
After:
- saveMedia catches download/write failures, records the media type, and
logs a console.warn instead of rejecting.
- appendMediaFailureNote() (exported pure helper, mirroring the file's
testable-helper convention) surfaces '[<type> could not be downloaded]'
in the event body, so the agent learns media was sent rather than the
attachment vanishing. Applied before the '[<type> received]' fallback
so an uncaptioned failed image reads as a failure, not an arrival.
The reuploadRequest recovery half of nanoclaw#2895 is already wired in
bridge.js (downloadMediaMessage(..., { reuploadRequest:
sock.updateMediaMessage })); this ports the containment half hermes was
missing.
Tests: 3 new cases in bridge.native.test.mjs (note formatting, uncaptioned
failure containment, captioned failure note). All 5 bridge test files pass.
