Merge upstream master into net descriptor-based ep_size branch

- Resolve .gitignore conflict: incorporate upstream's .worktrees entry and
  expand dependency path patterns to cover all tools/get_deps.py fetched dirs
  (lib/, tools/linkermap, tools/uf2, hw/mcu/*) instead of listing only a few

- Auto-merged upstream changes: build system cleanups, BSP updates,
  portability fixes, new boards (nrf54lm20dk, stm32h743_weact),
  fatfs relocation, and many other upstream improvements

- Net driver changes (ecm_rndis_device.c, ncm_device.c, net_device.h,
  usbd.h, usb_descriptors.c) retain our PR's descriptor-based ep_size
  approach as our branch takes precedence

Co-authored-by: HiFiPhile <4375114+HiFiPhile@users.noreply.github.com>