docs: NOMADSTAR_METEOR_PRO likely needs no new board port (#5)

[jamesarich]

Summary

Issue #5 asked whether NOMADSTAR_METEOR_PRO (hwModel 96, RAK4631-based) can reuse wiscore_rak4631_board's existing bootloader, or needs its own src/boards/ entry.

Diffed meshtastic/firmware's variants/nrf52840/rak4631_nomadstar_meteor_pro/variant.h against plain rak4631's. The only differences are peripheral-level, added via a WisBlock IO module:

• RGB LED driver chip (HAS_NCP5623 → HAS_LP5562)
• Sensor I2C bus addresses (WB_I2C1_SDA/SCL vs. plain PIN_WIRE_SDA/SCL)
• A buzzer pin, some battery-sense calibration constants, an RTC module

Nothing touches this bootloader's MCU, flash layout, or USB identity — it's the same RAK4631 module underneath, just with more peripherals wired onto the WisBlock header. Its own platformio.ini even sets board = wiscore_rak4631 (the same PlatformIO board definition plain RAK4631 uses).

Changes

• README.md: notes NomadStar Meteor Pro under the existing RAK4631 note, explaining why it should already work.
• AGENTS.md: updates the board-gaps gotcha with this finding.

No new src/boards/ entry — opening a board PR that just duplicated wiscore_rak4631_board's files for identical bootloader-relevant hardware would add confusion, not clarity.

Why draft

This is a documented, sourced inference from firmware's variant files, not a hardware confirmation. If someone with this device flashes wiscore_rak4631_board's existing UF2 onto one and confirms it boots correctly, this can come out of draft and #5 can close — referencing that confirmation.

Test plan

• Docs only, no code/board changes — CI unaffected
• Real NomadStar Meteor Pro hardware: confirm wiscore_rak4631_board's UF2 flashes and boots correctly

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