[T-001] Sync tinyusb-rw612 fork to upstream TinyUSB 0.21 (native RW612 support): rebase ~36 patches onto 0.21.0, gap-analyze which custom NCM/CI_HS/OSAL patches are covered upstream, decide vanilla 0.21 vs thinner fork

[chipsoft]

T-001: Sync tinyusb-rw612 fork to upstream TinyUSB 0.21 (native RW612 support): rebase ~36 patches onto 0.21.0, gap-analyze which custom NCM/CI_HS/OSAL patches are covered upstream, decide vanilla 0.21 vs thinner fork

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This body is regenerated by the backlog CLI on every mutation. Manual edits below this line are NOT authoritative — only the hidden backlog:v1 metadata comment above is canonical.

[chipsoft]

Created in the wrong repo by backlog tooling (cwd was inside the submodule). Re-created in chipsoft/frdmrw612_freertos_hello.