Alan-Jowett / sonde / 23604727988

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feat: configurable I2C pin assignments via BLE provisioning (#490) (#510)

Add ND-0608: I2C bus GPIO pins configurable via NVS, set during BLE
provisioning. Single firmware binary works across ESP32-C3 boards.

- PlatformStorage: read_i2c0_pins() / write_i2c0_pins() with GPIO
  range validation (0-21) and SDA!=SCL check
- EspHal::new(sda, scl): accepts pin config from NVS
- NODE_PROVISION: optional trailing CBOR pin config (backward compat)
- Spec: ND-0608, PT-1214, node-design §10.3, ble-pairing-tool §4.1
- Validation: T-N0608a-f, T-PT-1214a-b

Closes #490

Co-authored-by: Alan Jowett <alan.jowett@microsoft.com>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

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