agent: builder model: opus max_turns: 100 budget_usd: 20 —
Score: a red develop is fixed forward first (CLAUDE.md); main stands still until then (last green 590cd7c). Lane 1, before P5a.
Keep a struct of views a call makes, across a package's files; either-text map keys (0.0.1258)) had no CI run of its own. c7e5b66 touches only crates/rs2nika/convert/src (not a workspace member, never dumped: 60b1154’s body). So the cause is eeaefb1, a compiler and std change.crates/nikaia-std/src/index.rs:469 (a new impl Get<&EitherText> for HashMap<String, V, S> beside the generic impl<K, Q, V, S> Get<&Q> for HashMap<K, V, S> at :438), tools/buffers.nika (holders, held_text_field, opaque_puts), tools/emit_stmt.nika, tools/text_tiers.nika, contracts/keep.rs (buffer_plans takes beside), contracts/tether.rs, check/mod.rs, emit/mod.rs; the lowered files follow.Get impl for HashMap makes m.get(&k) / m[k] ambiguous where k’s type is inferred later: rustc E0282/E0283 in lowered programs that compiled before. Suspect 2: the keep changes lower a one-file program to Rust that rustc refuses (E0502/E0505/E0597). Suspect 3: an entry of KNOWN (crates/nikaia/tests/it/accepted_sweep.rs:42, e.g. a10522b5e28c4937, #730 item 5) compiles now: the sweep fails on that too.accepted_sweep.rs header. check::check_against (in-process, the it tests) dumps every accepted one-file program to $NIKAIA_DUMP_ACCEPTED/<binary>-<hash>.nika; the ignored test accepted_sweep:: lowers each and runs rustc --emit=metadata in batches of 40. CI: .github/workflows/nikaia.yml :166 and :385. The CI log is not readable here; from 60b1154 on a failing sweep writes annotations, but do not wait for them.it binary only, never the full suite): d=$(mktemp -d), NIKAIA_DUMP_ACCEPTED=$d cargo test --release -p nikaia --test it (failures of other tests do not matter here), then NIKAIA_DUMP_ACCEPTED=$d cargo test --release -p nikaia --test it accepted_sweep:: -- --ignored. Note the failing hash(es), the tests that dumped them and rustc’s first error.index.rs impl; suspect 2: the buffers.nika change with lower-std for that file), re-run only the sweep (step 1’s second command over the same dump; for suspect 2 re-dump with the failing test’s filter only). Restore the hunk afterwards.tests/compiler program that runs the failing shape (Fix, do not work around): suspect 1, make the either-text lookup not compete in inference (e.g. the emitter writes .as_str() for an EitherText key, or the impl moves behind a distinct trait method), keeping eeaefb1’s own tests in tests/compiler/tests passing; suspect 2, the keep lowering; suspect 3, remove the KNOWN entry that compiles now (that is the only KNOWN edit allowed: never add one) and say which commit fixed it. Run the sweep again over a fresh dump of the failing test’s filter: it passes.The sweep passes over step 1’s dump (or a fresh dump, if the fix changed the dumped sources), eeaefb1’s tests and the new test pass (nikaia test over tests/compiler, filter by name), clippy clean, scripts/pre-push-check.sh passes. Commit: <what was wrong> (fix-forward, sweep red since eeaefb1), Fixes none. Changelog: one sentence if the compiler or std changed, else none.
The fix is more than one step, or would undo what eeaefb1 decided (then report under Found: with the program and the error, partial); the cause is in another lane’s uncommitted file. Not yours: crates/rs2nika/convert/nikaia.{contracts,derived,proofs}, docs/briefs/k1-comptime-tree.* and lane-bugs-557a-span-here.md.run.json (uncommitted in the checkout).
Read docs/builder-facts.md.
docs/builder-facts.md first. develop in the main checkout; git status at start: other agents’ uncommitted files are not yours, never touch or stage them.git add <files> only; commit after each step; git push origin develop fast-forward, no rebase (rejected: report Pushed: rejected, go on committing).cargo fmt, cargo clippy --all-targets -- -D warnings, scripts/pre-push-check.sh, and the gate of .claude/agents/builder.md (#852).CHANGELOG.md, badges; no new NK code. New tests in Nikaia only; never the full suite. No foreground sleep, no polling; scripts in files.NIKAIA_CACHE_LIMIT=2G; at most two clones with target/ in the machine; delete your own clone’s target/ and target/release/nikaia-scratch at the end; report GB freed./home/user/Nikaia/docs/briefs/b-fixforward-sweep2.md.report.md)Fields of docs/architect.md, Briefs and reports: Result: done|noop|partial|blocked (the bare word alone on that line: Result: done, never a summary after it, which cuts the batch, b869a 2026-10-27; Owner: is a question for the owner or none, never a role), Files, Commit, Body (optional, one paragraph for the commit message), Fixes, Pushed, Tests, Gate (green|red), Deviation, Found, Needs, Changelog, Owner, Disk freed, and for a move Rs2nika: (the kept N of M lines of rs2nika --score, then the three costliest hand edits; none for a task that moves no Rust). none where nothing, and then the bare word: Deviation: none (a note) cuts the batch (batch.nika compares exactly); a note goes into the commit message. Found: is only for a defect outside your change (it cuts the batch); a converter draft that came out wrong is no Found:, it is one of the costliest edits under Rs2nika:, which the converter lane reads (e12-4b 2026-10-27); how you solved your own step goes into the commit message. Deviation: is only a step of the brief built otherwise than written or not built (a choice the brief left to you, such as keep what X needs and say so, is no deviation: it goes into the commit message; nor is building two steps in one commit when every step is built, e12-3a 2026-10-27, nor a step another commit on develop already built, shown by your test failing with that commit’s change reverted, b889 2026-10-27: name the commit in Body:); how you verified (e.g. a test not run against the unfixed compiler) goes under Tests:. A noop says why under Tests: (what was probed), not under Deviation:. Final answer, one line: done <sha>, report <path> (or BLOCKED: ... / PUSH REJECTED ...).
Attribution: Co-Authored-By: Claude Opus 5.5 noreply@anthropic.com Claude-Session: https://claude.ai/code/session_01GFeMqxRbtUMiGVyDMxsvEq