Add RWfit ring family support

[saksham2001]

Summary

Adds support for the RWfit (com.rw.revivalfit) ring family — often rebranded (the known field unit was sold as a "Colmi") — reconstructed from the vendor app's source, shared with the vendor's cooperation.

• One family, two wire protocols: all RWfit rings share the A00A/B002/B003 GATT but speak either the legacy 0x7E framing (XOR checksum, serials, mandatory two-sided ACK handshake) or the JieLi 0xAB framing (CRC-16/ARC, {CMD,Key,KeyFlag} triples, headerless continuations). The framing is only knowable from which sibling services (AE00/Telink/PixArt) service discovery turns up, so a new WearableDriver.servicesDiscovered hook (default no-op) lets the driver pick its codec before the first byte is written.
• Full metric set on both protocols: steps, HR, SpO₂, sleep (incl. REM and the JieLi stage-transition-stream reconstruction), BP, HRV, stress, temperature, blood sugar, battery, bind/unbind, time sync, profile/goal/units, and JieLi realtime measurements. Per-unit sensors are capability-gated off the ring's own feature report (legacy 0x03 bitmap / JieLi bind TLV); the manual/realtime measurement set is granted only on JieLi links — the vendor app has no legacy measure command at all.
• Timezone handling deliberately diverges from the vendor (whose legacy math is off by an hour half the year in DST zones): both framings' local-epoch stamps are converted through a latched-offset RWfitClock, the JringClock contract.
• Remote validation loop: a new Privacy & Data toggle ("Capture Bluetooth diagnostics", off by default, clearable) lets release/TestFlight builds persist raw packets and include them in the diagnostics export — the only way to validate a family nobody has in hand.
• Recognition is by service/manufacturer-data signals only (A00A; company IDs 0x05D6/0x06D6), never by name; the catalog card's name patterns stay empty until the first real capture.
• Docs: docs/hardware/rwfit.md records every layout with vendor file:line evidence and the open [unconfirmed] items (steps slot duration, distance units, realtime +10 offset, bind type byte).

Test plan

• Full xcodebuild test suite passes.
• 5 new suites with fixtures computed from the vendor parsers: both codecs (incl. CRC-16/ARC reference vector, multi-packet/continuation reassembly, ACK quirks), decoder (timezone/DST tests, sleep expansion for both formats, scaling), driver (framing selection, ACK-before-decode, command-gate discipline), history pager.
• PairingMatchingTests cross-claim matrix extended: RWfit claims only its own signals, claims no names, is registered last, and no existing family's advertisement is stolen.
• On-hardware validation via the tester's diagnostics export (raw-capture toggle → pair → sync → export).