1. Most time and turns:
   • The it run with the brief’s broad filters took about 5 minutes, with clippy running beside it. It needed a second run to clear the two failures, which only happen when the machine is busy.
   • tests/compiler took one more long run.
   • Getting the [forms project_lower_] rows to match cost 3 re-converts. {x} receiver rows and the long read_to_string(...).and_then(...) row never matched. I had to work out by trial and error whether forms are matched against the Rust or the Nikaia text.
2. Looked up that the brief could have handed me:
   • How [forms] rows match: against the Nikaia draft text, and {x} needs a dotted chain.
   • The M3b throws-host pattern: the held/failed helper and Result<_, Box<dyn Error>>.
   • The Ledger type is ty.nika:1233 and FnContract’s fields.
   • There is no zip in tools code, and a map is changed by get, clone and insert.
   • The signatures of Cache::lookup/record, Choices::naming(self), Reads::unused() -> Vec<String> and check(...).
   • How the plan table marks a row as built.
3. Checks run:
   • lower-std with the old binary: 2 runs, which caught one NK1102.
   • cargo check: caught the missing RefCell import and the stale lowered type.
   • One build cycle, then a second build after cargo fmt.
   • --lib project::, the it filters plus the guard set, clippy, tests/compiler, pre-push-check and --score.
   • Wasted: the extra form re-converts, and the second build. Running cargo fmt before the build would have saved it.
   • tests/compiler was not required for a change outside check/ and emit/, and its one failure was another agent’s test.
4. The one change that would save the most: builder-facts should give the exact matching rule for [forms] rows and show one worked row with {x}. Second to that: let the schematic-host brief drop trait methods that only the host itself uses (key_source, dependencies).

project_lower.nika changed on disk after my commit, and I did not check by whom. Someone should check that the committed version (6a65c91b) is still what is on disk.

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