fix(pr-contract): relax marker prose guard

[ArchonVII]

Summary

• Loosens the shared PR contract marker detector so normal completed prose is not rejected for a legitimate word that used to be treated as a banned token.
• Keeps explicit unfinished markers rejected while preserving the existing ready-for-review structure checks, including literal filler values made only from the marker word.

Verification

• npx vitest run scripts/pr-contract.test.mjs

command: npx vitest run scripts/pr-contract.test.mjs
location: local
result: passed; 23 tests
timestamp: 2026-06-20T19:00:54Z

• git diff --check

command: git diff --check
location: local
result: exit 0; CRLF warnings only
timestamp: 2026-06-20T19:00:54Z

Verification Notes

Full local npm test on Windows stopped while importing unchanged scripts/doc-policy-lint.test.mjs with SyntaxError: Invalid or unexpected token. Recent upstream Self-test (scripts) on main passed in GitHub Actions run 27698751593, and this PR should use the PR self-test for the Linux full-suite signal. The automated review thread was addressed by adding literal-filler rejection tests.

Docs / Changelog

Added a changelog fragment and a repository update log entry.

Plan/status artifacts: none created or used by this lane.

Linked Issue

Closes #90

Risks

• Risk level: Low; this narrows one marker detector token while preserving unfinished marker rejection.
• Rollback: Revert this commit to restore the previous marker token list.
• Follow-ups: Move v1 after merge.

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

💡 Codex Review

Here are some automated review suggestions for this pull request.

Reviewed commit: 2402650491

ℹ️ About Codex in GitHub

Your team has set up Codex to review pull requests in this repo. Reviews are triggered when you

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• Mark a draft as ready
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[chatgpt-codex-connector]

Reject explicit placeholder prose beyond bare filler

When a generated body leaves text such as This is a placeholder for the summary in ## Summary, ### Verification Notes, or ## Docs / Changelog, this helper no longer treats it as a placeholder because it only rejects lines whose words are all placeholder or exactly placeholder text; hasSubstantiveContent() then sees enough characters and the non-doc PR passes the ready-for-review contract. This is a fresh scenario beyond the earlier bare placeholder placeholder placeholder case, and it regresses explicit placeholder filler that the contract still says must be removed.

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