CardSat v0.9.22

v0.9.22 supersedes v0.9.21, which was broken. If you flashed 0.9.21, please
update. 0.9.22 fixes two regressions that made 0.9.21 effectively unusable on the
Cardputer ADV (see "Critical fixes" below). The feature content is otherwise the
same as 0.9.21 (the IR pass beacon, described further down).

Critical fixes (v0.9.22)

• Voice memo now records on the Cardputer ADV. The ADV's ES8311 mic codec is
  driven through M5Unified's M5.Mic with cfg.internal_mic enabled, built against
  ESP-IDF 5.4.x (Espressif esp32 Arduino core 3.2.x). See the note at the end and
  MANUAL.md §"Voice memo" for the toolchain requirement.

• Downloads no longer freeze the screen. On the ESP-IDF 5.4.x toolchain (required
  for the mic), the display canvas was being freed to make heap room for the TLS
  handshake and then could not be reallocated — the 64 KB block never returns on this
  toolchain — leaving the whole device frozen after any update. The display canvas is
  now an 8 bpp palette sprite (~32 KB instead of ~64 KB), which leaves enough free
  heap (~85 KB) for the handshake with the sprite kept allocated the whole time. The
  sprite is never freed/recreated, so the screen can't freeze, and a real RGB565
  palette keeps colors correct. Net result: updates download and the UI stays live and
  full-color throughout.

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An IR pass-alert beacon: the built-in IR LED now flashes on each pass-alert event,
with a distinct number of flashes per event, so you can build your own
IR-triggered hardware.

Hardware status. Host-verified only (tokenizer-balanced; the carrier timing
and flash-count state machine compiled with mocks and checked off-device). The
actual IR output and a receiver decoding it have not been confirmed on a device —
verify before relying on it.

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IR pass beacon (build-your-own trigger)

Enable Settings → Station → IR pass beacon (off by default) and CardSat will
flash the Cardputer's built-in IR LED (GPIO 44) on every existing pass-alert event,
in addition to the usual beeps. Each event sends a distinct number of flashes:

Event	Flashes
T-60 s to AOS	1
T-30 s to AOS	2
T-10 s to AOS	3
AOS (pass start)	4
TCA (peak elevation)	5
LOS (pass end)	6

Each flash is a ~60 ms burst of standard 38 kHz IR carrier with ~140 ms gaps —
the kind any common IR receiver/demodulator (TSOP38238, TSOP4838, etc.) detects.
CardSat only transmits the counts; the receiving side is yours to design. Point
a 38 kHz receiver at the Cardputer, count the pulses, and trigger whatever you want:
power up a rotator/preamp at T-10, flash a shack light at AOS, start an SDR
recording, drive a louder external alert, or log events on a second microcontroller.

The flashing is fully non-blocking — one burst at a time between the normal
tracking updates — so radio, rotator, and web control keep running throughout. It's
gated by the AOS-alarm system, so it only fires when the AOS alarm is on.

Host-verified only. The 38 kHz carrier, duty cycle, and burst/gap timing may need
tuning for your particular receiver; treat the flash counts as the stable
contract and the exact waveform as adjustable. The feature uses only GPIO 44 (the
built-in IR LED) and is off until you enable it.

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Notes

• Cardputer ADV voice memo works when built against ESP-IDF 5.4.x. The ADV's
  ES8311 mic codec records correctly on the Espressif esp32 Arduino core 3.2.x
  (IDF 5.4.2); on the 3.3.x core (IDF 5.5.x) the codec's record clock isn't driven
  and recordings are silent — an upstream regression
  (espressif/esp-idf#18621),
  not a CardSat bug. Voice memo captures via M5Unified's M5.Mic with
  cfg.internal_mic enabled. Only voice memo is affected by the toolchain; every
  other feature builds and runs on either core. The boot log's IDF version (5.4.x)
  confirms a correct build. See MANUAL.md §"Voice memo".

• All host-verified only. The IR carrier generation (LEDC PWM at 38 kHz, gated per
  burst) and the flash state machine were checked off-device (balance + g++
  semantic compile + a mock-clock run of every flash count), but on-device
  confirmation — that a real IR receiver sees and counts the bursts — is still
  needed.