v3.18.3

## What's Changed
* fix(reddit): fetch window should track the requested date range by @slkbuilds in https://github.com/mvanhorn/last30days-skill/pull/860
* Fix Chromium cookie extraction to search all profiles, not just Default by @ellacaggfitness-lang in https://github.com/mvanhorn/last30days-skill/pull/725
* fix(polymarket): keep domain-sweep markets the topic filter drops by @slkbuilds in https://github.com/mvanhorn/last30days-skill/pull/859
* fix(render): blend thread relevance into Top Community Comments ranking by @singlaamitesh in https://github.com/mvanhorn/last30days-skill/pull/701
* Fix stale footer path after collision-safe save fallback by @terry-li-hm in https://github.com/mvanhorn/last30days-skill/pull/850
* fix(planner): reject invalid explicit plan schemas by @spiky02plateau in https://github.com/mvanhorn/last30days-skill/pull/841
* fix(render): keep the synthesis contract reachable when stdout is truncated (#726) by @nnhhoang in https://github.com/mvanhorn/last30days-skill/pull/727
* fix(pipeline): respect explicit source filters for company topics by @spiky02plateau in https://github.com/mvanhorn/last30days-skill/pull/842
* fix(store): guard store_findings against None engagement_score on update path by @nicolefinateri in https://github.com/mvanhorn/last30days-skill/pull/796
* fix(ci): make changelog-guard workflow parseable again by @tmchow in https://github.com/mvanhorn/last30days-skill/pull/878
* fix(youtube): log ScrapeCreators transcript rescue instead of masking it by @amitvijapur in https://github.com/mvanhorn/last30days-skill/pull/851
* chore(release): bump version to 3.18.3 by @github-actions[bot] in https://github.com/mvanhorn/last30days-skill/pull/879

## New Contributors
* @slkbuilds made their first contribution in https://github.com/mvanhorn/last30days-skill/pull/860
* @ellacaggfitness-lang made their first contribution in https://github.com/mvanhorn/last30days-skill/pull/725
* @singlaamitesh made their first contribution in https://github.com/mvanhorn/last30days-skill/pull/701
* @nnhhoang made their first contribution in https://github.com/mvanhorn/last30days-skill/pull/727
* @nicolefinateri made their first contribution in https://github.com/mvanhorn/last30days-skill/pull/796
* @amitvijapur made their first contribution in https://github.com/mvanhorn/last30days-skill/pull/851

**Full Changelog**: https://github.com/mvanhorn/last30days-skill/compare/v3.18.2...v3.18.3