1. Time and turns. Three things cost the most:
   • Each lower-std round was slow.
   • The cargo build ran about 4 minutes.
   • The shared tree was broken by another agent’s uncommitted threads.nika and grammar_run.nika after my first successful build. That blocked the rebuild, clippy, the it modules and the lower-std --bounds before/after, so the run ended partial. The session also died once mid-lower-std, and I redid that step.
2. Lookups the brief could have handed me.
   • The Stmt, Expr::Binary and Item shapes, and what check_visit_stmt returns. It returns a flat preorder list, so the holes-after-each-node order needs a separate roots function, which I wrote as bounds_report_roots.
   • The syntax gaps I hit one error at a time:
     • grammar is a reserved word.
     • .clone() on a text literal is NK1301.
     • use std::i64 is NK1156, and the way to widen a u32 is span.start as i64 (seen in bounds_walk.nika).
   • Where check --bounds and the probe s2_walk.nika live. I never found the probe and wrote the file from scratch.
3. Checks.
   • Run and useful: lower-std (clean and fixpoint), and old-vs-new check --bounds on the 15 .bounds programs, which were identical.
   • Wasted: the first sample, examples/* and tests/compiler, which was mostly refusals, and one lower-std --bounds pair whose output was an error from the other agent’s file.
   • Not run: the it tests, clippy, the lib tests.
4. One change. Give the brief a “tree health” pre-flight: run cargo check -p nikaia-std --features compiler first and note any other agent’s modified .nika files. Also tell builders to build before touching any shared file. A second change would be to hand the builder a stash-free way to build against a clean checkout of the touched files.

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