The pcid_interface crate now reads the two env vars emitted by
driver-manager's SpawnDecision committee:
- REDBEAR_DRIVER_PCI_IRQ_MODE: lets the spawned child know
whether to fall back to MSI / INTx instead of MSI-X
- REDBEAR_DRIVER_DISABLE_ACCEL: lets the spawned child suppress
hardware acceleration (matches PciQuirkFlags::DISABLE_ACCEL)
Both values are stored on PciFunctionHandle and exposed via
accessors (irq_mode_hint / disable_accel_hint) so the driver
daemons can read them at startup. 6 new unit tests cover the
env-var parsing.
Refs: local/docs/DRIVER-MANAGER-MIGRATION-PLAN.md § 5.2 D2.7.
Red Bear OS
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