codeSplitter: self-healing CI, a failed check or guard trip opens a fix task on the branch #1015

Follow-up to #938: self-healing CI.

When a required check fails on a codeSplitter branch, or a merge guard trips (committed conflict markers, a JSON registry that doesn't parse, #937), open a fix task on that branch on its own: an agent run with the failing log and the files involved. When it pushes, CI runs again. Cap the retries (say 2), and after that the branch waits for a person, with the attempts attached.

Gate it behind the existing AGENTS flag and the hosted budget.

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