[NSchatz]

Why main is red

The Release workflow's Verify step on d906bda (run 37705238602) failed in test/conformance/working-tree-is-clean.test.ts:

AssertionError: expected Set{} to deeply equal Set{ '.cosyte-usage-stdout/' }

That test compares git status of the real working tree before and after a conformance run. The .cosyte-usage-stdout/ directory belongs to a different file: the README usage case in test/docs-content.test.ts writes it and removes it in afterAll. Vitest runs test files in parallel, so the "before" snapshot saw the directory and the "after" one did not. Two more files write into the tree briefly in the same way: the tsup build that docs-content spawns (tsup.config.bundled_<hash>.mjs at the root) and the phi-scan override-gate case (it appends to the tracked phi-scan-overrides.md, then restores it). The Release runs before d906bda passed on the same test, so this is a race, not a regression.

The fix

vitest.config.ts now has two projects:

• suite: every test file except the snapshot test, sequence.groupOrder: 0, still in parallel.
• working-tree: only test/conformance/working-tree-is-clean.test.ts, sequence.groupOrder: 1. Vitest starts this group only after the first group has finished, so nothing else writes to the tree while the snapshot is taken.

The assertion is unchanged, and no test is skipped, deleted or loosened. The include globs move onto the first project because extends: true concatenates include arrays. Set at the root, they pulled the whole suite into the second project, and a first draft of this change caught that. documentation/agent-notes.md gets a short paragraph in the AC-9 section that points at the config.

No changeset: nothing under src/ changes, and no published surface moves.

Verification

• Reproduction: a temporary probe test (not committed) holds a path in the repo root until the conformance run starts writing. On main it fails AC-9 with the same shape as CI. With this change the probe never overlaps the run, and AC-9 passes.
• Full run, JSON reporter: the snapshot file starts 1.3 s after the last other file ends. 43 files, 1369 passed, 1 skipped, the same counts as before.
• Release Verify sequence locally: pnpm typecheck, lint, test, build, attw, all green. Also green: test:coverage (all directory gates), format:check, check:no-emdash, check:no-internal-refs, check:agent-notes, phi-scan.

Harness-Task: 1

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