Fix CH32V203 I2C slave lowering

[Alan-Jowett]

Summary

• correct CH32V203 I2C slave initialization ordering so PE is enabled before ACK
• regenerate the Embassy I2C HAL and retain the async master interpolation fix
• simplify master/slave hardware smokes and report received register/value pairs over CDC

Validation

• cargo test generate_embassy_uses_raw_wch_pfic_irq_indices`n- release builds for the SHT40 control, I2C master, and I2C slave smokes
• hardware-validated repeated slave ISR packet reception using the generated init_slave() and set_own_address_7bit(0x42) paths

[Copilot]

Pull request overview

This PR fixes CH32V203 I2C slave initialization and refines generated Embassy I2C support, including an async master bus-idle wait improvement, while simplifying the I2C master/slave hardware smoke binaries (with the slave smoke now reporting observed register/value pairs over USB CDC).

Changes:

• Update generated async I2C master helpers to await bus-idle using the async wait mechanism (instead of a blocking spin wait).
• Correct CH32V203 I2C slave init semantics/order (PE before ACK) and adjust own-address ADD0 handling in evidence + generated HAL.
• Simplify I2C master/slave smoke binaries; slave smoke now streams received register/value pairs over CDC.

Reviewed changes

Copilot reviewed 2 out of 9 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
src/main.rs	Updates Embassy I2C codegen for async bus-idle waiting; strengthens generator output assertions.
evidence/wch/ch32v203g6u6/hair.json	Adjusts semantic operation descriptions for slave init ordering and ADD0 handling.
evidence/wch/ch32v203g6u6/generated/embassy/src/i2c.rs	Regenerated Embassy I2C HAL reflecting async bus-idle waits and corrected slave init/address behavior.
evidence/wch/ch32v203g6u6/generated/embassy-i2c-slave-slave-smoke/src/main.rs	Reworks slave smoke to use USB CDC logging and ISR-captured register/value reporting.
evidence/wch/ch32v203g6u6/generated/embassy-i2c-slave-slave-smoke/Cargo.toml	Adds USB + heapless deps needed for CDC logging in the slave smoke.
evidence/wch/ch32v203g6u6/generated/embassy-i2c-slave-slave-smoke/Cargo.lock	Lockfile updates for new slave smoke dependencies.
evidence/wch/ch32v203g6u6/generated/embassy-i2c-slave-master-smoke/src/main.rs	Simplifies master smoke to periodically send an I2C request (no USB logging).
evidence/wch/ch32v203g6u6/generated/embassy-i2c-slave-master-smoke/Cargo.toml	Removes USB-related deps/features from master smoke.
evidence/wch/ch32v203g6u6/generated/embassy-i2c-slave-master-smoke/Cargo.lock	Lockfile updates reflecting removed master smoke dependencies.

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[Copilot]

Pull request overview

Copilot reviewed 2 out of 9 changed files in this pull request and generated no new comments.