Expose WSPR mode and plan identity in simulator traces

[lbussy]

Related to WsprryPi/WsprryPi#400.

This dependency change supports the parent repository's complete application-planned WSPR simulator check.

It:

• assigns deterministic controller-owned plan IDs while preserving the compiler-populated request ID;
• keeps request and plan identities semantically distinct across repeated preparation;
• adds the transmission mode and request ID to the stable simulated-backend JSON trace;
• verifies same-instance configure, execute, cleanup, and trace-state reset;
• adds focused contract coverage for these fields and lifecycle behaviors.

The trace remains schema version 1 because request_id is additive and all existing fields retain their names and semantics.

Validation:

• make simulated-backend-test
• make transmission-controller-contract-test
• make startup-quiesce-test
• make si5351-transition-test

All validation was performed on Debian ARM64 with hardware access disabled. No GPIO, MMIO, mailbox, DMA, I2C, device-node, service, installation, or RF operation was performed.