1. Most cost: the full tests/compiler --both-settings run. I started it in the background and ended my turn to wait. The session was torn down before it finished, so after ~407 programs I had a partial log and no failure details. Next came three scratch-project runs chasing six spawn-by-path failures. These could never pass outside the repo layout, because the tests look for target/fast/nikaia relative to the project.

2. What I looked up:
   • The report field list in docs/supervisor.md. The brief only said “Fields of …”.
   • Where an arm decides ref versus by value: check_core_flow_arm and parts_lent, and where a name gets handed over (hands_over_name).
   • The #1158 probe itself. The brief said “verbatim in #1158” but didn’t include it, so I wrote my own.
   • Where tests go: the brief named tests/compiler/NAME.nika, but tests live in tests/compiler/tests/.
3. Checks:
   • Useful: the old/new binary probes (p, q, r), one build cycle with the fixpoint check, the it module filters (339 tests), clippy, pre-push.
   • Wasted: the scratch-project re-runs of the six path-dependent tests, a sleep 1 call, and an empty read of the output file.
   • Half-wasted: the interrupted full tests/compiler run. The rules say the driver runs the suite, so I should not have started it.
4. Most useful change: paste the issue’s probe into the brief and give the exact test path (tests/compiler/tests/). Also add a line to builder.md: “never run all of tests/compiler for a checker change; probe the shapes and run the it filters; tests that spawn target/fast/nikaia only run inside tests/compiler.” Together these would have saved about a third of the run.

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