Summary

Fixes WhatsApp text-document attachment handling end-to-end so generated or received .html, .md, and .markdown files are delivered and processed as native documents instead of falling through to generic/octet-stream, plain text, or omitted-media paths.

What changed

• Adds text/html / .html / .htm and markdown document coverage (.md, .markdown) to the shared document MIME/extraction paths.
• Expands MEDIA: extraction and bare local path detection so paths like MEDIA:/tmp/article.md, /tmp/article.markdown, and /tmp/report.html are recognized and routed as native attachments.
• Updates the WhatsApp bridge MIME table used by /send-media so outbound markdown documents are sent with mimetype: text/markdown.
• Wires send_message WhatsApp media delivery through the local bridge /send-media endpoint, including document captions and multiple attachments, instead of silently omitting MEDIA: files.
• Preserves inbound document MIME metadata from the bridge (mediaMimeTypes) so Python sees HTML documents as text/html even when fallback extension inference would be lossy.
• Ensures inbound documents without a filename get an extension inferred from their MIME type, so text/html still caches as .html and can be text-injected for the agent.
• Adds regression coverage for HTML/markdown MEDIA: tags, bare local HTML/markdown attachment paths, shared MIME mappings, WhatsApp bridge markdown MIME entries, WhatsApp inbound HTML documents, and send_message WhatsApp media routing.

Validation

• node --check scripts/whatsapp-bridge/bridge.js
• git diff --check
• scripts/run_tests.sh tests/gateway/test_media_extraction.py tests/gateway/test_whatsapp_connect.py::TestHtmlDocumentAttachments tests/tools/test_send_message_tool.py::TestSendToPlatformWhatsapp — wrapper only selected test_media_extraction.py for this nodeid-shaped command; 11 passed, 0 failed
• scripts/run_tests.sh tests/gateway/test_whatsapp_connect.py tests/tools/test_send_message_tool.py — 151 passed, 0 failed

No gateway or WhatsApp bridge restart was performed in Sebastian's live environment; the code is updated in the PR branch only and will take effect after an explicit later restart/deploy.

Refresh status

• Updated the existing PR branch with the markdown/send_message follow-up requested from live WhatsApp debugging.
• Current head: f3abeafbb.
• Mergeability/check status should be read from the latest GitHub API response because editing this body can temporarily reset GitHub's mergeability calculation.
• Notes: PR now covers both the original HTML attachment fix and the discovered .md / .markdown WhatsApp attachment path, including the active MEDIA: extractor and send_message tool path.
• Test plan:
  • node --check scripts/whatsapp-bridge/bridge.js
  • git diff --check
  • scripts/run_tests.sh tests/gateway/test_media_extraction.py tests/gateway/test_whatsapp_connect.py::TestHtmlDocumentAttachments tests/tools/test_send_message_tool.py::TestSendToPlatformWhatsapp — 11 passed, 0 failed for selected file
  • scripts/run_tests.sh tests/gateway/test_whatsapp_connect.py tests/tools/test_send_message_tool.py — 151 passed, 0 failed