[guide] AGENTS.md and CONTRIBUTING.md state stale tests/tools harness coverage floors (97/97) — enforced floors are now 99/98 #1329

Documentation Gap

AGENTS.md (lines 52-55) and CONTRIBUTING.md (lines 187-188) both document the tests/tools/ harness coverage floors as 100% lines / 97% regions, and 97% regions per harness file.

Since #1319 (commit 8766e9f, merged 2026-10-11) the enforced floors in package.json are:

--check-harness 100 --check-harness-regions 99 --check-harness-file-regions 98

i.e. 99% harness regions / 98% per-harness-file regions. The docs still say 97/97.

Impact

Contributors and agents reading either file get the wrong floors for the required npm run test:unit:coverage:check gate. A change that passes the documented 97/97 but fails the real 99/98 produces a surprising red "Validate repository" check on the PR.

Recommendation

One PR updating both spots:

• AGENTS.md — the "Unit Tests" bullet: change 97% regions, 97% regions per harness file to 99% regions, 98% regions per harness file.
• CONTRIBUTING.md — the test:unit:coverage:check paragraph: same correction.

Verification performed: read package.json test:unit:coverage:check at HEAD (fb75c1a) and git log -L confirming 8766e9f (#1319) ratcheted --check-harness-regions 97->99 and --check-harness-file-regions 97->98 without touching the docs. No open issue or PR covers this (gh search for "harness coverage" and "AGENTS.md" returned no open matches).

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