dangernoodle-io / TaipanMiner / 25085825088

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chore(pio): add flash-factory custom target for fresh / prov-mode flashes (#253)

`pio run -t upload` only writes the app partition at 0x20000, leaving
NVS and bootloader/partitions intact. To bring a device up clean (no
saved wifi creds → boots into AP provisioning mode), the operator
needs to erase + write firmware.factory.bin. Adds a custom pio target
that does both in one step using pio's bundled esptool, with the env's
detected port and configured upload speed.

  pio run -e tdongle-s3 -t flash-factory
  make flash-factory-tdongle-s3   # Makefile wrapper

- scripts/flash_factory.py: env.AddCustomTarget('flash-factory')
  depending on buildprog; chains erase_flash + write_flash 0x0 via
  $UPLOADER ($PYTHONEXE esptool.py from tool-esptoolpy)
- platformio.ini env:esp32s3 extra_scripts: register the script so all
  variants inherit the target
- Makefile: flash-factory-% wrapper invokes the pio target so make
  syntax stays consistent with the existing flash-% target

Useful for hardware testing of the new prov flow (PR #252) without
needing the bare esptool incantation.

Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>

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