teknium1 34e8d088c2 feat(slack): fix app_mention 404 + add document/video support ...

- Register no-op app_mention event handler to suppress Bolt 404 errors.
  The 'message' handler already processes @mentions in channels, so
  app_mention is acknowledged without duplicate processing.

- Add send_document() for native file attachments (PDFs, CSVs, etc.)
  via files_upload_v2, matching the pattern from Telegram PR #779.

- Add send_video() for native video uploads via files_upload_v2.

- Handle incoming document attachments from users: download, cache,
  and inject text content for .txt/.md files (capped at 100KB),
  following the same pattern as the Telegram adapter.

- Add _download_slack_file_bytes() helper for raw byte downloads.

- Add 24 new tests covering all new functionality.

Fixes the unhandled app_mention events reported in gateway logs.

2026-03-09 13:02:59 -07:00

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