docs(changelog): v1.3.3 placeholder date 2024-XX-XX (placeholder never resolved)

gh issue create --title "docs(changelog): v1.3.3 placeholder date 2024-XX-XX (placeholder never resolved)" --label "documentation,audit,priority:medium" --body "## Finding

CHANGELOG.md's v1.3.3 entry has a placeholder date '2024-XX-XX'. The placeholder should be replaced with the actual release date.

## Affected code

- CHANGELOG.md — v1.3.3 entry

## Reproduction

1. Grep CHANGELOG for '2024-XX-XX'.

## Suggested fix

Look up the actual release date on GitHub Releases for v1.3.3 (or git tag date). Replace the placeholder.

## Source

F2 audit 2026-09-03 (docs audit). Reporter: subagent-pekodbj7.

## Related

- Part of EPIC #[epic-number]
- Closes: #NONE (no existing issue)"