ported 56ff low level protocol from android

[saksham2001]

Summary

Migrates the low-level (non-UI) features the Android port (foureight84/PulseLoopAndroid) added, into PulseLoop iOS. The iOS architecture already had most of the seams (profile-sync, capability gating, per-driver sync engines), so this is mostly implementing the jring/56ff side of existing protocols and adding new metric kinds.

• Metrics added: Blood pressure, Fatigue, Stress, Blood sugar, and HRV
• Fixed mislabeled opcodes
• Added calibration commands and personal data (required for calibration)
• Added connection reliability and initial setup

Related issues

Type of change

• 🐛 Bug fix (non-breaking change that fixes an issue)
• ✨ New feature (non-breaking change that adds functionality)
• 📟 New / improved wearable support (BLE driver layer)
• 🤖 Coach / LLM change (tools, prompts, orchestration)
• 🎨 UI / DesignSystem change
• 🧹 Refactor / chore (no behavior change)
• 📝 Docs only
• ⚠️ Breaking change (existing data, settings, or APIs change)

How was this tested?

Build succeeds, 186 tests pass (49 new), 0 serious lint violations. Changes are staged, not committed.

• Added / updated unit tests (PulseLoopTests)
• Ran the test suite locally (⌘U in Xcode)
• Tested on a physical device with a real ring — model:
• Tested with demo data (-seedDemo YES, no hardware)
• N/A (docs / non-code change)

Privacy & data

• This change does not send health data off-device without explicit user action.
• No secrets, API keys, or personal data are committed.
• N/A

Screenshots / recordings

Checklist

• My code follows the project's style (SwiftLint passes).
• I ran the tests and they pass.
• I updated docs / README where relevant.
• I read the Contributing guide.