tests: drop manual soft-reset test from audioio suite

Test 6 (soft-reset during active playback) is covered in practice by
the external frequency-sweep rig, which exercises start / stop / re-
play across 30 tones in series — the same lifecycle paths the manual
Ctrl-C/Ctrl-D test was checking. Drops the README section, the table
row, the results-file note, and the trailing "remaining manual step"
print so the docs/runner consistently say "Tests 1–5".

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Author: Chris Nourse

tests/circuitpython-manual/audioio/README.md

@@ -11,7 +11,6 @@ These tests exercise the DAC-based `audioio.AudioOut` implementation added for S
 | 3 — Looping Sine Wave | Yes | Yes (audio check) |
 | 4 — deinit and Re-init | Yes | No |
 | 5 — Stereo Playback | Yes | Yes (audio check) |
-| 6 — Soft Reset Cleanup | No (manual Ctrl-C/D) | No |
 
 `run_serial_tests.py` automates Tests 1–5: it copies the necessary files to the
 board and runs each script over the serial REPL, comparing the printed output to
@@ -291,27 +290,6 @@ done
 - On a scope: probing A0 and A1 simultaneously during phases 1 and 2 should
   show one channel idle (mid-scale DC) while the other carries the sine.
 
-## Test 6 — Soft Reset Cleanup *(manual)*
-
-Verifies that `audioout_reset()` properly cleans up when the REPL soft-resets during active playback.
-
-1. Start a looping tone in the REPL:
-
-```python
-import audiocore, audioio, board, array, math, time
-length = 8000 // 440
-s16 = array.array("h", [int(math.sin(math.pi * 2 * i / length) * 32767) for i in range(length)])
-dac = audioio.AudioOut(board.A0)
-dac.play(audiocore.RawSample(s16, sample_rate=8000), loop=True)
-```
-
-2. While the tone is playing, press **Ctrl-C** then **Ctrl-D** (soft reset).
-
-**Expected:**
-- **Ctrl-C** interrupts the Python code but the tone *keeps playing* — this is normal. The DMA and TIM6 run in hardware independently of Python; a `KeyboardInterrupt` does not stop them.
-- **Ctrl-D** triggers a soft reset which calls `audioout_reset()`. The tone stops immediately and the board returns to the `>>>` prompt with no crash or fault.
-- Running any of the above tests again afterwards should work normally.
-
 ## Oscilloscope Checks (Optional)
 
 Each test script drives `board.D4` (pin D4) low at the start of each playback and high when it ends. This provides a clean trigger edge for a scope.

tests/circuitpython-manual/audioio/results.md

@@ -1,7 +1,7 @@
 # audioio — `run_serial_tests.py` results
 
 - **Board:** Adafruit Feather STM32F405 Express
-- **Suite:** Tests 1–5 automated (Test 6 soft-reset is manual)
+- **Suite:** Tests 1–5 automated
 - **Result:** all PASS
 
 ```
@@ -492,5 +492,5 @@ SUMMARY
   [PASS] Test 5 — Stereo Playback
 
 All automated tests passed.
-Remaining manual step: Test 6 (soft-reset) and audio/oscilloscope verification.
+Remaining manual step: audio/oscilloscope verification.
 ```

tests/circuitpython-manual/audioio/run_serial_tests.py

@@ -2,13 +2,11 @@
 """
 run_serial_tests.py — Automated REPL-based tests for STM32F405 audioio.
 
-Automates Tests 1, 2, 3, and 4 from README.md by:
+Automates Tests 1–5 from README.md by:
   1. Copying WAV files and test scripts to the board via mpremote.
   2. Running each test on the device via the CircuitPython REPL.
   3. Comparing captured output to expected patterns and reporting PASS/FAIL.
 
-Test 5 (soft-reset cleanup) still requires manual interaction.
-
 Usage:
     python3 run_serial_tests.py
     python3 run_serial_tests.py --port /dev/cu.usbmodemXXX
@@ -559,7 +557,7 @@ def main():
     print()
     if all_passed:
         print("All automated tests passed.")
-        print("Remaining manual step: Test 6 (soft-reset) and audio/oscilloscope verification.")
+        print("Remaining manual step: audio/oscilloscope verification.")
         sys.exit(0)
     else:
         print("One or more tests FAILED — see details above.")