[bdbarnett]

CircuitPython builds now use 11.0.0-alpha.2 (d53b2277c). Its core is still MicroPython 1.29, so UPSTREAM doesn't move.

Patches

• 0007 (audiomixer: level 1.0 passes samples through unchanged) is removed. alpha.2 fixes it upstream (Fix audiomixer phase inversion and use DSP on Cortex-M33 adafruit/circuitpython#11617, commits 11a329885 and fc57c0f36): mult16signed now multiplies in integers and shifts by 15, so a level of 1.0 is exact. The series skips the number, as the MicroPython one does.
• 0006 (espressif: build the ESP-IDF components a user C module asks for) is rebased. The espressif port rewrote its component list and Makefile for ESP-IDF 6.1, so the old hunks no longer applied. What it does is unchanged.
• 0001-0005 and 0008-0010 apply to alpha.2 as they are.

ESP-IDF. alpha.2's espressif port builds with ESP-IDF 6.1 (6.0 before). The component pins in deps.lock (the camera sensor components, esp_h264, usb) are left where they were; the ESP32-P4 usbhost cell builds against them and will say if they need to move.

Checked locally. The unix port builds with all the patches applied and reports CircuitPython 11.0.0-alpha.2. The audiodsp tests that run on it pass (ring_through_mixer.py: 1063 checks), and the repository's unit tests pass. The espressif cells are left to CI.

The README-level version mentions (build plan, displayif's UPSTREAM note, the workflow comment) now say alpha.2 / ESP-IDF 6.1.