eslint-factory: 6 of 49 shipped rules undocumented in README.md

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Summary

eslint-factory/src/index.ts currently registers 49 rules (all also wired up with "warn" severity in eslint.config.cjs), but eslint-factory/README.md only documents 43 of them via ### \rulename`` sections. This is the fifth time this exact class of debt has been filed and closed (previously #45950, #46355, #50196, #50267 — each closed after the README caught up, then reaccumulating as new rules shipped without doc updates).

Undocumented rules

6 rules missing a README section

• no-json-stringify-set-or-map
• require-nan-check-after-split-index-parse
• require-error-code-in-thrown-error
• require-invalid-date-check-before-compare
• require-sync-exec-timeout
• require-lastindex-reset-before-global-exec-loop

Note that 3 of these (require-error-code-in-thrown-error, require-invalid-date-check-before-compare, require-sync-exec-timeout) already have closed refinement issues against their rule logic, so their behavior is stable enough to document; the other 3 are newer and have not yet had a dedicated review pass.

Acceptance criteria

• Add a ### \rulename`` README section for each of the 6 rules above, following the existing section format (purpose, example of flagged code, example of correct code).
• Verify the count of README ### \rulename`sections matches the count of rules exported fromsrc/index.ts` after this change.
• Consider adding a lightweight check (e.g. a test or script) that fails when a newly-registered rule has no matching README section, to prevent this recurring for a sixth time.

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• expires on Aug 22, 2026, 9:32 PM UTC-08:00