Add the RCC6 headless companion family

[n30nex]

Adds the exact released RCC6 headless BLE, native-USB, and Wi-Fi Web/TCP companion builds to suite v1.8 RC1. Pins the product source commit, all six install images, checksums, release documentation, and the ninth firmware submodule. Existing RC52/RCC6 headless repeater and Room Server profiles remain product-owned and are referenced rather than duplicated.

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[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Initialize the new submodule in catalog CI

The catalog workflow in .github/workflows/verify.yml lines 17–20 still syncs and updates only the previous five RadioCore repositories, so this new submodule is never cloned in CI. Because verify_catalog.py merely compares the catalog commit with the staged gitlink via git ls-files, validation can pass even if this repository or pinned commit cannot actually be fetched; add this path to both the workflow's git submodule sync and git submodule update commands.

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