1. Most time: waiting on another agent’s half-written project_drive.nika, which broke the shared build for about two minutes. After that, the full tests/compiler --both-settings run was the longest single step. Finding the cause took only about 8 turns, because the brief’s suspected location was nearly right.
2. What I looked up: the brief named check_arguments.nika, but the fix belonged at the end of the_compiler_writes_the_reference in check_references.nika. That function already had the same wrap for ref T?, about 20 lines below the :124 the brief cited. I also had to find out how the emitter orders before, &, how and after, and that emit_arg_opening tells an Option<&T> parameter from an &Option<T> one. A one-line hint like “the ref T? wrap already exists at the end of that function; extend it” would have saved about 4 turns of reading.
3. Checks:
   • Run: the reproduction on old and new binaries, the build cycle with lower-std twice plus a checksum to confirm the fixpoint, the unfixed suite binary on the new test, tests/compiler --both-settings, the it name filters, fmt, clippy on 1.97 and 1.99.1, and pre-push-check.
   • Partly wasted: the first build, because the other agent’s file broke it. The third lower-std (to checksum the fixpoint) took seconds. Clippy on two toolchains was required, since this machine’s stable is behind CI’s.
4. Change that would save the most: builder.md should say what to do when another agent’s unfinished file breaks the shared build. For example: wait on that file’s mtime in one background call, or fall back to cargo check -p nikaia-std --features compiler limited to your own lowered files. Separately, the brief’s Suspected location should cite the function where the existing sibling rule lives, not only its caller.

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