t-dev-089-037-053

Changes

• Added receive-only Preset Scan to ARF Frequency Analyzer.
• Added ranked modulation preset results and direct handoff to the system Sub-GHz Receiver.
• Fixed Scan -> RX being parsed as a .sub file (cannot parse file).

Validation

• Firmware API 88.0
• Branch dev, commit 22cdf5d3, dirty=false
• 34 focused tests passed
• F7 CI and release validation passed
• C2 gap: 31,852 bytes

This is an experimental dev build. Hardware acceptance for issue #116 remains open.