BlueskyPublisher only attached images; posts whose media was a video
published as text-only with no embed. Bluesky videos do not use the PDS
uploadBlob path — they go through the separate video service
(video.bsky.app), which transcodes the file and writes the resulting blob
back to the account's PDS.
Add a video path that runs when no image embed was built (a post carries
either images or one video, never both):
1. Resolve the account's real PDS host from its DID document (entryway
accounts store bsky.social as `service`, but the video service-auth
audience must be the actual *.host.bsky.network PDS).
2. Mint a com.atproto.server.getServiceAuth token scoped to uploadBlob.
3. POST the bytes to app.bsky.video.uploadVideo.
4. Poll app.bsky.video.getJobStatus until the blob is ready, then embed
it as app.bsky.embed.video.
Failures (download, oversized >100MB, service-auth, transcode) log and
return null so the post still publishes as text rather than crashing the
job — mirroring uploadBlob(). New NSID constants live in BlueskyLexicon
and the video service / PLC directory hosts are configurable.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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