feat(firmware): validate configuration and migrate sensor-driven flight APIs

Validate configuration through its owning schemas and keep board
declarations separate from shared F722 resource ownership. Bound USB
transitions, isolate transport failures and retain restart-only activation.

Migrate navigation and flight consumers with the sensor and schema
contracts. Require explicit installation data and synchronous output
authority; board motor outputs remain inhibited.

Validation: assembled-prefix host tests, strict Clippy, platform/USB tests
and both ARM release builds. Final-source coverage and scoped Miri/Kani
evidence are retained separately from hardware qualification.

firmware/libs/kaptan-mavlink/definitions/publish/heartbeat.xml

@@ -11,7 +11,7 @@
   </enums>
   <messages>
     <message id="51027" name="HEARTBEAT">
-      <description>Periodic liveness and discovery publication for the initialized output-inhibited firmware composition.</description>
+      <description>Liveness and discovery while initialized with outputs inhibited.</description>
       <field type="uint8_t" name="state" enum="HEARTBEAT_STATE"/>
     </message>
   </messages>