node-26#9, same shape as the ADS-B commit. Adds POST /telemetry/ais
(same node-key auth, same org_id-stamped upsert-by-key pattern, this time
by mmsi into a new `vessels` collection) and its docInMyOrg() firestore
rule. Frontend gets useVessels() (mirrors useAircraft(), longer staleness
window since AIS position reports are minutes apart, not seconds) and an
opt-in "Vessels" map overlay.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Logan CusanoandClaude Sonnet 5
3d2b722c64