1. What cost the most: the drive.nika rebase with --autostash in the shared checkout. It took my uncommitted files away mid-run and folded my Part III hunks into another agent’s commit. Finding the saved copy (.git/rebase-merge/autostash, c76cbd6f), waiting for the rebase to end and re-applying my diff cost about 10 turns. After that came two red gate rounds of about 10 minutes each: fmt wanted pub use crate::env in sorted order, and clippy refused items after the test module in hash.rs.
2. What I had to look up:
   • A new std module needs a pub use in lib.rs’s prelude. Generated programs reach modules only through it, so without it rustc reports “cannot find module env”.
   • Free functions take String, not ref String; ref String is refused outside extern.
   • fs::Path has no is_dir; the declared way is fs::metadata(..).is_dir().
   • Part III’s touches table is section 13.5.
   • std has no as_bytes, only .bytes().collect().
3. Checks I ran:
   • Probes with nikaia run on a copy of the binary; the first lower-std and the fixpoint diff.
   • cargo check --features compiler; the gate three times; nikaia-std --lib hash::; the five it filters.
   • Wasted: two gate rounds that rebuilt and re-lowered only to fail at fmt and clippy. cargo fmt --check and the clippy of nikaia-std first would have cost under a minute.
4. One change that would have saved the most: builder.md should say “before the gate, run cargo fmt --check and cargo clippy -p <crate> --all-targets -- -D warnings on the crates you touched”. The brief for a new std module should list its three places: pub mod in lib.rs, pub use in the prelude, and the std.contracts block. Separately, drive.nika should not rebase with --autostash while builders are working, or should at least leave the autostash in git stash list.

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