docs: record the AIS unavailable-code handling

CONTRIBUTING asks for docs/CURRENT-STATE.md and CHANGELOG.md in the same PR
as a runtime behaviour change.

Co-Authored-By: Claude Opus 5 (1M context) <[email protected]>
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Theerayut BoonkirdandClaude Opus 5 committed 2026-09-18 00:41:06 +01:00
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# Changelog
- Report AIS speed and course that carry the standard "not available" code as
unknown instead of 102.3 knots and 360 degrees. Genuine readings, including a
stopped vessel's zero and the highest encodable values, are unchanged.
- Distinguish PARTIAL vessel snapshots from STALE data in the layer panel, with
accepted-record counts and unchanged retention, freshness and outage safeguards.