chore(pins): re-pin zephyr + fprime-zephyr onto trimmed integration branches

[Mikefly123]

Drops two changes from the USP radio changeset as part of the pre-merge
blast-radius trim. Both were pruned on the merits; neither costs any
measured throughput.

fprime-zephyr c81485f -> 3da24b8 (feat/proves-usp-radio-trimmed)
Removes the re-arm semaphore (OSSF/fprime-zephyr#19, closed). It had a
measured null result — 35.8 s before and after, 1.00x on the downlink
ladder — and the PR body itself retracted its premise: the k_sleep poll
it replaced never actually slept at saturation.

The GFSK RX->TX wedge fix (#23) was rebased off it onto feat/usp-radio.
Verified: the rebased tree differs from the pre-trim tree by exactly the
semaphore's 30 lines in UspRadio.cpp — quiesceRadio(), the TX_DONE
timeout recovery, the comStatus-SUCCESS-after-drop path and the
TxOutcomePolicy UTs are all intact. P5_GMSK_83K (#20, draft) was rebased
onto the new #23 head and is retained unchanged.

zephyr 3838a28 -> 144acbc (feat/proves-usp-radio-trimmed)
Removes the cdc_acm poll_out bounded wait (OSSF/zephyr#2, closed). The
added bound sits behind data->flow_ctrl, which is false on the v5e from
both directions: hw-flow-control is absent from the cdc_acm_uart0 node
(verified in the generated devicetree, not just source), and the sole
uart_configure() caller sets UART_CFG_FLOW_CTRL_NONE. The code was
unreachable in the flight image.

The TX-FIFO drain fix (#1) is explicitly RETAINED — it is reachable
wherever a USB host is enumerated, which includes the self-hosted
integration-uart/integration-radio runners and their Korad power-cycle
and re-enumeration steps. Fork delta drops from +21/-1 to +11/-0.

Old branches feat/proves-usp-radio are retained on both forks pending
review of this pin; pruned branches are retained for recoverability.

Co-Authored-By: Claude noreply@anthropic.com

---

Part of the pre-merge blast-radius trim of the USP radio changeset (tracking: #439).

Verification done before opening:

• fprime-zephyr: rebased tree differs from pre-trim by exactly the semaphore's 30 lines; wedge fix + UTs byte-intact.
• zephyr: fork delta vs v4.4.1-base confirmed +11/-0 (drain only) vs +21/-1 before.

Still needed: build + unit tests + full CI on this pin, and a bench smoke. Because neither pruned change is on the throughput ladder, the expected downlink number is unchanged at ~36.08 s / 4,953 B/s — this pin should not move perf at all, which is itself the check.

🤖 Generated with Claude Code

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