codeSplitters dependency doctor's fixer: hosted runs, live lines, long runs #231

Follow-up to #196. Loose ends of the fixer:

• It only runs on the desktop (like the tests it depends on). A container run on Cloudflare (as sandbox.ts does for one-file agents) would let hosted repos use it.
• The agent works on the last commit. A file with uncommitted live edits on main is left out of the fix and named in the report's note, rather than rebased.
• A run is considered dead after an hour (STALE in deps.ts). Several fix tries on a slow test suite could pass that, letting a second run start.
• Not yet tried live with a real agent CLI on a real broken update; the tests stand in for the agent.

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