Add RTM2000 channel display control

[Scaxlibur]

Depends on

• Core typed contract: Add typed scope channel display control WaveBench#15

Merge and release the Core change before releasing this plugin version.

Summary

• implement typed channel-display query, configure, and restore operations for RTM2000
• advertise scope.channel_display_configure_v2 for analog channels 1 and 2
• update the RTM2000 package to 0.14.0 and document the capability boundary
• cover strict readback parsing, no-op behavior, successful writes, malformed responses, and restore paths

Hardware validation

A controlled RTM2032 run exercised CH2 through the real Core service:

• CH2 ON → OFF completed and independent readback confirmed OFF
• OFF → ON recovery completed through Core with one audited write and a healthy session
• DG4202 outputs remained OFF
• final independent snapshot showed CH1/CH2 ON, DCL coupling, and no overload

The real mutation was exercised on CH2; CH1 uses the same bounded command path and is covered offline. The first acceptance wrapper hit a local diagnostics KeyError after the Core operation had already completed, so the state was independently re-read before recovery; this was a harness issue, not an instrument-operation failure.

Validation

• RTM2000 package: 186 passed
• full plugin repository on this branch: 1849 passed, 3 skipped
• Ruff: passed
• pip check: passed
• development-environment check: passed
• package check / wheel metadata: passed
• plugin doctor: passed
• git diff --check: passed