1. What cost the most turns: the 129-level depth test hung. The cause was a bug already on develop: the flow grammar re-read every nested key, so parse time grew exponentially. Finding it took probes from n=20 to n=26 and then a grammar rewrite (FlowTail). After that, rustc errors that nikaia check had passed cost several builds: the Node? guard parameter (“FnOnce”), and peek("-" Gap). Last, nikaia fmt broke long rule lines before */+, so I broke about ten lines by hand and checked fmt stayed stable each time.
2. What I had to look up that the brief could have handed me:
   • Tags: the brief says “this brief resolves them”, but ADR-yaml-1 D6 says the tree keeps tags and load resolves them. I had to settle that from the ADR myself.
   • YAML 1.2.2 cases: the reference cases for each construct (6.19 for !! redefined, XLQ9, 2JQS).
   • Grammar syntax: how cut, peek and an optional label behind a guard are spelled.
   • The old diff: sorting which parts of the earlier attempt’s diff held up.
3. Checks run:
   • Useful: nikaia test --project packages/yaml (several runs), fmt::every_nika_file, pre-push-check.sh, and the small n-level flow probes.
   • Wasted:
     • one test round against the old diff’s unblessed .stdout files (directives and explicit_keys failed);
     • repeated full package runs where a single program would have done;
     • commit.nika --dry-run, which showed the script would paste the “Earlier attempt” section into the message, so I committed by hand.
   • Not run: the gate script, because nothing under crates/ changed. The report’s Gate: green means the brief’s package gate only.
4. The change that would save the most: keep the Attribution: block the last section of a brief, with nothing after it, so commit.nika can be used and the push is not delayed until develop moves. Close behind: note in the brief that the flow grammar on develop is exponential in nesting, since the depth test cannot run until that is fixed. Also make the brief agree with ADR D6 on tags: kept as written, resolved only by load.

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