preflight-media-check

I'd like you to add a skill to Wideframe called "preflight-media-check".

What it should do:
Before any task, confirm the workspace, drive, sign-in, and media are all there, or stop with the exact blocker.

Before you run anything, ask me to confirm:
- Which workspace, folder, or drive holds the source media?
- Is the source local, or on a cloud account (Google Drive, Dropbox, Frame.io)?
- Roughly how many media files do you expect to find?

Then do the work:
1. For cloud sources, check the relevant status command (gdrive-status, dropbox-status, or frameio-status) for an authorized connection.
2. Resolve the workspace or folder path and confirm it exists and is readable.
3. Run media-info-batch and count the readable media files.
4. Compare the count to the user's expectation.
5. If any check fails, stop and report the specific blocker (not signed in, drive not mounted, path empty).

Do not grade your own work. When the output is ready, hand it to a separate verification subagent that has its own context window. Give it the output, the choices I confirmed, and the pass criteria below. It reviews the quality, writes specific feedback, and returns PASS or FAIL.

Pass criteria:
- The path resolves and is readable.
- At least one readable media file is found, or the exact shortfall is reported.
- No auth or connection error is outstanding for the chosen source.
- The found file count is reported against the expected count.

If it returns FAIL, apply the feedback, redo the affected work, and verify again with a new subagent. Repeat until it returns PASS, then show me the result.

Once it works, save it as a reusable skill named "preflight-media-check" so I can run it again by saying /preflight-media-check.