Fix stm32f723disco host/cdc_msc_hid HIL: UART RX starvation + DWC2 DMA split-IN NAK storm (#3677)

Fix stm32f723disco host HIL: UART RX starvation + DWC2 split bulk NAK/XactErr handling (#3677)
stm32f7 BSP — UART RX starvation
- The host console USART shared interrupt priority with the USB OTG ISR, so a long
  OTG interrupt could starve RXNE and drop received bytes. Raise the USART RX IRQ
  above OTG_FS/OTG_HS in both the bare-metal and FreeRTOS init paths, guarded by
  #ifdef UART_ID so boards without a UART console keep the default OTG priority.

dwc2 host — split NAK/XactErr handling
- Slave mode: a persistently-NAKing split bulk/control IN poll re-armed the
  start-split immediately, storming the ISR and starving task context. Throttle by
  disabling the channel and re-arming on the resulting halt (no frame deferral).
- Buffer-DMA mode: a pure split bulk-OUT NAK was unhandled, leaving the channel
  halted and stalling the transfer — the dominant cause of CDC echo truncation.
  Handle it by rewinding the buffer pointers and retrying the start-split
  (Programming Guide v4.20a 5.1.4.2).
- Buffer-DMA mode: a split bulk-OUT XactErr was retried immediately, exhausting
  HCD_XFER_ERROR_MAX before the transient cleared. Throttle via channel_disable +
  re-arm to give the hub TT a recovery gap, mirroring slave mode.
- All three are scoped to split transfers (hcsplt.split_en); non-split NAK/XactErr
  keep the core-handled / immediate-retry behavior. The OUT XactErr throttle also
  excludes periodic split, where channel_disable() is a no-op and would wedge the
  channel. The nak_disabled flag is generalized to retry_disabled and honors
  xfer->closing so an endpoint close during a throttled retry tears down cleanly.

Verified on stm32f723disco HIL (slave + CFG_TUH_DWC2_DMA_ENABLE): host/cdc_msc_hid,
msc_file_explorer, and device_info all pass on both variants; DMA CDC echo went
from ~15-25% raw failure to 10/10 clean.

1 files changed, 2 insertions, 2 deletions

diff --git a/AGENTS.md b/AGENTS.md
index 5c9908d19..93faa6332 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -18,7 +18,7 @@ Bias toward caution over speed. For trivial tasks, use judgment.
 - **Language/style:** C99, 2-space indent (no tabs), snake_case helpers, `UPPER_CASE` macros. Public APIs use `tud_`/`tuh_`; macros use `TU_`. Headers self-contained with `#if CFG_TUSB_MCU` guards.
 - **Safety:** no dynamic allocation; defer ISR work to task context; use `TU_ASSERT()` for error checks; always check return values; include order: C stdlib → tusb common → drivers → classes.
 - **Layout:** `src/` core, `hw/{mcu,bsp}/` MCU+BSP, `examples/{device,host,dual}/`, `test/{unit-test,fuzz,hil}/`, `docs/`, `tools/`.
-- **Commits/PRs:** imperative mood, scoped changes, link issues, include test/build evidence.
+- **Commits/PRs:** imperative mood, scoped changes, link issues, include test/build evidence. After opening a PR, monitor it and drive it to green: address automated review comments (Copilot/Codex/Claude) and fix any failing CI builds, pushing follow-up commits until checks pass and review threads are resolved. Useful: `gh pr checks <num> --watch`, `gh pr view <num> --comments`.
 - **Formatting/lint:** `clang-format` (`.clang-format`), `codespell` (`.codespellrc`), run `pre-commit run --all-files` before submitting.
 
 ## Bootstrap
@@ -204,7 +204,7 @@ Device examples need real hardware to validate runtime behavior; must at least b
 
 ## References
 
-- MCU reference manuals, datasheets, schematics: `$HOME/Documents/Calibre Library`.
+- MCU reference manuals, datasheets, schematics: `$HOME/Documents/calibre-library`.
 - Supported MCUs/boards: `hw/bsp/` and `docs/reference/boards.rst`.
 - USB classes: `src/class/{cdc,hid,msc,audio,…}/` — each has `*_device.c` and `*_host.c`.
 - Key files: `src/tusb.h`, `src/tusb_config.h`, `tools/get_deps.py`, `tools/build.py`, `test/unit-test/project.yml`.