watch9: pairs and banks raw data, decodes nothing yet

[abdulsaheel]

pairs-only adapter for the unbranded Watch9 board. no signals declared, no commands sent.

Summary by Sourcery

Add experimental Watch9 pairing and raw-data collection without decoding device frames or deriving health metrics.

New Features:

• Add experimental Watch9 support for pairing, bounded listening, and raw frame archiving without decoding or derived health signals.
• Expose Watch9 pairing and manual/background synchronization in the device UI and sync flows.

Bug Fixes:

• Ensure Watch9 connections are cleaned up reliably after synchronization failures or teardown errors.

Enhancements:

• Register the Watch9 service and characteristic while documenting its notify-only, no-write behavior.
• Preserve non-empty Watch9 notifications as source-tagged archive records with arrival timestamps.

Tests:

• Add coverage confirming Watch9 declares no signals, archives frames verbatim, ignores empty notifications, performs no writes, and emits no offload checkpoints.

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Review configuration:

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Review profile: ASSERTIVE

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Run ID: ee06336c-34e0-412a-b742-85685c8600c4

📥 Commits

Reviewing files that changed from the base of the PR and between b98cae6 and b9f8015.

⛔ Files ignored due to path filters (3)

• test/adapter_signals_registry_test.dart is excluded by !test/**
• test/adapters/watch9_test.dart is excluded by !test/**
• test/band_registry_test.dart is excluded by !test/**

📒 Files selected for processing (6)

• lib/ble/adapters/_registry.dart
• lib/ble/adapters/watch9.dart
• lib/ble/watch9_link.dart
• lib/sync/background_sync.dart
• lib/ui2/pairing/device_picker.dart
• lib/ui2/profile/devices.dart

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Reviewer's Guide

Adds experimental Watch9 support end to end: the board can be paired, connected during background or manual sync, listened to on its single known characteristic for 20 seconds, and have every non-empty notification archived verbatim, while intentionally declaring no signals, decoding no payloads, and sending no commands.

File-Level Changes

Change	Details	Files
Registers the experimental Watch9 board as a notify-only adapter with no decoded signals or command support.	Adds the Watch9 service and shared command/notification characteristic constants. Adds a registry entry using arrival timestamps, an empty signal map, and no derivation sources. Implements a listener that ignores empty notifications and emits each non-empty frame verbatim as raw data. Adds tests covering registry shape, raw-frame preservation, empty notifications, no writes, and no offload checkpoints.	lib/ble/adapters/_registry.dart lib/ble/adapters/watch9.dart test/adapter_signals_registry_test.dart test/adapters/watch9_test.dart test/band_registry_test.dart
Adds a paired Watch9 link that connects, listens for a bounded window, archives raw frames, and safely tears down.	Looks up the paired secondary device and serializes sync operations. Discovers services, validates the required characteristic, and runs the adapter for 20 seconds without issuing commands. Persists non-empty frames as source-tagged archive records with null counter and timestamp fields. Integrates secondary-link limits, failure handling, stop/flush behavior, and background synchronization.	lib/ble/watch9_link.dart lib/sync/background_sync.dart
Exposes Watch9 pairing and manual synchronization in the device UI.	Adds pairing metadata and an English-only device-picker description. Adds a watch-specific icon and device detail sync action. Reports sync success or nearby/unavailable-device failure without affecting existing band sync.	lib/ui2/pairing/device_picker.dart lib/ui2/profile/devices.dart

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Hey - I've reviewed your changes and they look great!

Sourcery assessment

Needs a human reviewer. A successful Watch9 session persists every received frame as an ArchiveRecord, including frames that may be malformed or from an incorrectly identified device. Reverting the code stops future collection but does not remove already stored rows; the bounded records can be deleted or repaired separately.

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