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Two env vars change how runner git fetches handle retries and stalled delta resolution.
What's wrong with this entry?
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CLAUDE_RUNNER_FAIL_FAST_FETCHCCR_DELTA_RESET
What
On the runner and bring-your-own-cloud execution path, CLAUDE_RUNNER_FAIL_FAST_FETCH makes a git fetch fail immediately instead of retrying, and CCR_DELTA_RESET makes the fetch record HEAD beforehand and treat the "Resolving deltas" 100% progress line as a point that resets the stall timer. Both are read as plain booleans from the environment.
Evidence
CLAUDE_RUNNER_FAIL_FAST_FETCH
Strings lifted out of the shipped bundle, so the claim above can be checked against them.