codeSplitters: one real desktop Deploy run and one real dependency doctor run on live #300

Carried over from #216, whose live deploy is done (main f64ecf4 + the workerd bundle fix, accounts on, crons live).

• A real Deploy from the desktop. Use a small throwaway Rusty Buns app, with rustybuns.config.ts at its repo root (a monorepo app can't be deployed yet, codeSplitters Deploy/Preview: a folder setting for apps in a monorepo #295). Dig it up in the desktop app, set a stage, press Deploy, and watch clone → install → deploy → check go green. Every test so far has used a fake runner. Destroy the stage afterwards. The desktop deploys with this machine's Cloudflare login; if Alchemy's OAuth profile fails, launch it with CLOUDFLARE_API_TOKEN=$(npx wrangler auth token).
• A real dependency doctor run on live. Signed in as quinn, turn the doctor on for one repo with a stale dependency. The next hourly cron (0 * * * *) should run it and open a deps-* branch. The live site can't run tests there yet, so the branch is unverified (codeSplitters dependency doctor: run tests on Cloudflare in the sandbox container #197, codeSplitters dependency doctor's fixer: hosted runs, live lines, long runs #231). Turn it off again afterwards.

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