1. What cost the most: working out what state I was starting from. The brief says every file modified at the start is not mine, yet keeps.rs and the test files for exactly this brief were already in the tree. It took about 6 turns of reading the driver log, the file times, the earlier run’s scratchpad and the diffs to see that a killed run of this same brief had written them. The longest wait was the 10-minute tests/compiler run. Finding an unfixed binary took 3 more turns: there was no target/release/nikaia, and the toolchain tests fall back to a relative target/fast/nikaia under process::run(dir: tmp).
2. What I looked up that the brief could have given me:
   • Whether TraitMethod has a default body (it has none, so “the default body’s evidence” never applies).
   • How to run the toolchain tests (f) and (i) against an older binary.
   • That this was a resumed run. The driver knew it (“killed by time limit during b1012a”) but the brief didn’t say.
3. Checks run and checks wasted:
   • Run: the lower-std fixpoint cycle, tests/compiler with --both-settings, the six plain programs and (f)/(i) on the old binary, the contracts filter plus the guard set, clippy, --lib contracts::, pre-push-check and the badge.
   • Wasted:
     • Two failed tries of (f)/(i) on the old binary (relative toolchain path).
     • The tail --pid wait helper, which ran into its time limit after the test run had already finished.
     • One --lib link that failed on stale incremental files, which CARGO_INCREMENTAL=0 fixed.
   • Nothing ran twice in full.
4. The one change: when the driver restarts a killed brief, it should add a line to the brief: “resumed: the previous run’s files X, Y are yours, binary built at T”, and keep a pre-change binary in the scratchpad for the unfixed-compiler runs. Without that line, the “never stage files dirty at start” rule contradicts the task. I staged those files on my own judgement, and the supervisor should confirm that was right.

The push was rejected, so 0df2eefc still needs your rebase and push.

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