You tell the crew, and the page asks you to tell the crew #194

Pushed.

An open tell that nobody on the crew can pick up (crew has no builder) now shows up honestly instead of being hidden:

• src/web/studio/app.ts: the app's "Now" panel now also lists open, unassigned tells (excluding the repo's standing direction issue and anything a pending change already closes) when the crew has no builder, with a told badge and a note explaining why it's stuck plus a link to Settings → Crew. The old "Nothing yet. Tell the crew something." empty state no longer fires while such a tell exists.
• src/web/studio/shelf.ts: the home shelf row for such an app now reads "told — nobody on the crew to take it" instead of "quiet — tell the crew something".
• Two new batched reads back this without an N+1 per row: reposWithBuilder (src/core/agents.ts) and reposWithUnclaimedTell (src/core/issues.ts).
• Left out: I didn't touch the case where a builder exists but an issue is simply unassigned by hand — that's a different, honest situation ("somebody could take it but hasn't") and the issue's own cause analysis is specific to an empty crew.
• Tests: added a new test/studio.test.ts describe block ("a tell nobody on the crew can take is not \"quiet\"") covering both the app page and the shelf row; both failed before the change. Full bun x tsc --noEmit and the forge's check test list pass except for pre-existing sandbox-only git-push-auth failures present on main before this change too (confirmed via git stash).

Closes #183