v1.0.3

DEPRECATED: This release is no longer supported. Please upgrade to the latest release.

Deprecated: Use v1.0.6 (latest) or v1.0.5 (previous stable).\n\n## Summary\n- Standardizes release-driven PR workflow and changelog practices.\n- Adds a detailed PR template to enforce release notes and testing detail.\n\n## User-facing changes\n- None (documentation-only updates to repo process).\n\n## Breaking changes\n- None.\n\n## Migration/upgrade steps\n- None.\n\n## Testing\n- npm test\n\n## Risks/rollbacks\n- Low risk; documentation-only. Rollback by reverting the two commits if needed.\n\n## Known issues or follow-ups\n- None.\n