ch32v: framework field is ignored — noneos-sdk envs silently build the OpenWCH Arduino core (4 of 9 CI envs affected)

[zackees]

Part of the CH32V pipeline audit (#1102).

What happens

The CH32V orchestrator never looks at the env's framework value — it unconditionally installs the OpenWCH Arduino core and compiles its cores/arduino sources (Ch32vCores in crates/fbuild-library/src/library/ch32v_core.rs, wired in crates/fbuild-build-mcu/src/ch32v/orchestrator.rs). grep -r noneos crates/ has zero hits.

Four of the nine CH32V CI test envs declare a non-Arduino framework:

env	framework in platformio.ini	what actually builds
tests/platform/ch32v103	noneos-sdk	Arduino core
tests/platform/ch32v208	noneos-sdk	Arduino core
tests/platform/ch32v303	noneos-sdk	Arduino core
tests/platform/ch32x035	noneos-sdk	Arduino core

Consistently, genericCH32V208WBU6.json and genericCH32V303VCT6.json don't even list arduino in their frameworks arrays — yet an Arduino-core firmware is what the CH32V208/CH32V303 badges are actually certifying.

Why it matters

• A user porting a bare-metal noneos-sdk project from PlatformIO gets an Arduino build (different startup, main() owned by the core, setup()/loop() expected) with no warning — or a confusing wall of Arduino-core compile errors.
• The A/B contract with PlatformIO diverges silently: PlatformIO's ch32v platform honors framework = noneos-sdk with a bare vendor-SDK build.

Suggested fix

Pick one and make it explicit:

1. Validate: reject framework values the CH32V orchestrator doesn't implement with a clear error ("only framework = arduino is supported for ch32v today"), and change the four test envs (+ CI) to framework = arduino so the badges say what they test; or
2. Implement a noneos-sdk build mode (compile system/<series>/SRC + user code only, no Arduino core).

Option 1 is the honest minimum. Also reconcile the frameworks arrays in the V208/V303 board JSONs with whatever is chosen.

Severity: MEDIUM (silent behavioral mismatch with the declared config and with PlatformIO parity; no data loss).