First piece of the "My Videos" management tab: classifyVideoHealth decides the
maintenance status for one of the user's own videos from note-side data plus an
optional URL probe result. Pure/synchronous so it's deterministic and testable;
the controller will do the actual HEAD probe and pass the result in.
Statuses: no-source (no url AND no magnet) -> error; hosted-URL-unreachable ->
warning; deleted (tombstoned) -> info; otherwise ok. Key guardrail: only URLs
under the user's storage publicBaseUrl can be flagged dead — external/CORS-opaque
links are never cried wolf on. Deleted is checked before no-source since
soft-delete scrubs url/magnet.
Tests + mutation-verified: dropping the hosted guard (external false-alarm) and
removing deleted-precedence each fail a scenario.
Build + full lint green.
Co-Authored-By: Claude Opus 4.8 <[email protected]>
