Add Flex BMR467 PMBus PoL regulator device driver

[ruck314]

Description

Adds a PyRogue device driver for the Flex BMR467 series PMBus PoL regulator (Input 7.5–14 V, Output up to 120 A / 216 W).

A new `surf/devices/flex/` package was created, modeled on the existing `surf/devices/intel/_EM22xx.py` template and the `surf/devices/analog_devices/_Ltm4664.py` MFR-extension pattern. Register definitions are derived from the BMR467 technical specification (doc 28701-BMR 467 Rev E).

Changes

• `python/surf/devices/flex/init.py` — package init.
• `python/surf/devices/flex/_Bmr467.py` — `Bmr467(surf.protocols.i2c.PMBus)`:
  • `NOT_IMPLEMENTED` removes standard PMBus commands the BMR467 does not support (PAGE, fan commands, input-current `READ_IIN`/`IIN_OC_`, `READ_PIN`/`READ_POUT`, `POUT_MAX`/`MAX_DUTY`, `VIN_ON`/`VIN_OFF`, `TON_MAX_`, fan/other status registers, etc.). Also drops `IOUT_OC/UC_FAULT_RESPONSE` since the BMR467 replaces these with MFR variants at 0xE5/0xE6.
  • Adds manufacturer-specific registers (0xAD–0xFD) per the spec appendix.
  • Block-format commands are stubbed as comments (the I2C core only supports fixed-width word/byte transfers).
  • `LinkVariable` conversions: `VIN`, `VOUT`, total `IOUT`, per-phase `IOUT_PHASE[0]/[1]`, `TEMPERATURE[1..3]`, `DUTY_CYCLE`, `FREQUENCY`.

Verification

• Instantiated under rogue `v6.12.0` with a `MemEmulate` memBase (114 nodes; removed/added register assertions pass).
• `flake8 --count python/surf/devices/flex/` → clean (matches CI invocation).
• `compileall` → clean.

[codecov-commenter]

⚠️ Please install the to ensure uploads and comments are reliably processed by Codecov.

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 25.23%. Comparing base (e5c7de9) to head (51797aa).
⚠️ Report is 447 commits behind head on pre-release.
❗ Your organization needs to install the Codecov GitHub app to enable full functionality.

Additional details and impacted files

@@               Coverage Diff                @@
##           pre-release    #1439       +/-   ##
================================================
- Coverage        36.66%   25.23%   -11.44%     
================================================
  Files               28      258      +230     
  Lines             1459    20423    +18964     
================================================
+ Hits               535     5153     +4618     
- Misses             924    15270    +14346     

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.