sync-batdigest

Sync and deploy BatDigest by generating `batdigest-flask/dist`, inlining CSS, syncing into `batdigest-static`, committing/pushing, verifying live parity, and submitting IndexNow. Use when asked to "sync batdigest", "deploy batdigest", "generate dist", "inline css", "verify live deploy", or "submit IndexNow" for BatDigest.