[BarMal]

Summary

PR #8 was merged at 6d4f371, before the later backfill fixes landed on the branch. This PR carries those missing fixes forward from current master.

What changed

• Aligns the Gen4 WHOOP historical startup sequence with the Whoopsie reference: sends the five init/history packets uninterrupted and keeps SET_CLOCK out of the transfer start.
• Fixes historical batch ACKs to use the full 8-byte batch id from frame[17:25] instead of four bytes plus zero padding.
• Treats historical transfer idle after received frames as successful completion, while keeping explicit metadata/realtime/disconnect completion paths and extending the hard sync timeout for larger strap backlogs.
• Makes historical persistence order-agnostic so newest-to-oldest backfill samples are not silently dropped by live-stream interval downsampling.
• Adds a focused unit test for the historical ACK frame shape.

Validation

• ./gradlew.bat :app:assembleDebug
• ./gradlew.bat testDebugUnitTest