[ww8l]

Closes #145.

What

One driver (yaesu_ft857d) for the FT-857D and FT-897. The two radios share one clone protocol and one memory map; CHIRP drives both from a single class. Both models are seeded.

• Clone over the CAT/LINEAR jack, started from the radio's front panel. The operator presses [C] SEND for a read and [A] RCV before a write. The reader resyncs past a stray byte the radio can put on the line before block 0. Whether the image is US (with the extra 60 m block) or export is decided by the radio, not by a model pick.
• New shared operator steps. radios/operator.rs and OperatorStepBox let a radio session tell the operator what to press. A write waits for Continue, because a radio sitting in RCV is silent. They're used in the Program dialog and in both profile-editor radio bars. Any future front-panel-clone radio can reuse them.
• 200 memories with FM, NFM, AM, USB, LSB and CW, plus shifts, split, Tone/TSQL/DCS and 8-character tags. The encoder patches the record already in the slot, so a radio's own memories re-encode byte-identically.
• 46 menu settings across 40 menus. They're generated together with their schema from one measurement sheet, and a test asserts the two agree. Where the radio disagreed with CHIRP's map, CHIRP was corrected: the EXT MENU bit is byte 43.7, not 24.7; the CW QSK list starts at 10 ms, not 5 ms; DISP CONTRAST is raw − 2, not + 2.
• Cross-driver mode fix. channel_fit now asks each driver which analog modes its encoder writes (RadioDriver::analog_modes). USB/LSB/CW channels, and AM on radios whose encoder can't write it, are excluded with a reason instead of being programmed as dead FM memories. NFM is excluded on the FT5D, whose encoder has no narrow bit. A channel with no mode loads as FM, so the TD-H3 no longer writes it narrow. The CHIRP CSV writer now passes USB/LSB/CW through.

Hardware

All five ladder steps passed on an FT-897 (US) through a Digirig:

1. Identity write: read, then write the same image back, then read back. Only the radio's working-state bytes moved.
2. One-name write: memory 1 shows LADDER2 on the screen. That proves there's no checksum beyond the per-block sums.
3. Full codeplug: 8 memories, with frequency, mode, shift, tone type and tone value all confirmed on the radio's screen.
4. Band probe: 12 memories from 0.1 to 470 MHz, every one kept, edges checked on the screen.
5. Settings write through the real app (dev): Beep Volume written and confirmed on the radio.

The FT-857D on hand has a dead CAT TXD line and couldn't be read. It programs identically to the FT-897.

Review notes

• The settings form shows the 46 fields the evidence settles. The withheld rows and the reason for each are recorded with the measurements.
• hw_ladder.rs is the #[ignore]d hardware harness, kept like the BT-9000's.

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