Sync codex-desktop-linux with v0.2.5 release content

[github-actions]

v0.2.5 released. Update codex-desktop-linux to pin/ship this version and mirror the relevant changes.

v0.2.5 changelog

Added

• Added build-time GNOME extension / DBus identity overrides (CUL_*) so the
  codex-desktop-linux embedded copy can share this source while keeping its
  Codex extension identity, plus runtime CODEX_COMPUTER_USE_* aliases for the
  embedded input/backend knobs.

Documentation

• Cross-referenced the sibling agent-workspace-linux project in the README.

Fixed

• Bounded screenshot payloads by default before returning them to MCP hosts,
  while exposing opt-in screenshot sizing controls and coordinate metadata for
  downscaled captures.
• Added opt-in JPEG screenshot output with a caller-selected quality so agents
  can choose compression before the byte cap forces additional resizing.
• Ported downstream Linux readiness fixes: doctor now treats direct
  /dev/uinput and the XDG RemoteDesktop portal as valid development-input
  backends instead of requiring ydotoold in every ready setup.
• Ported downstream session hydration fixes for X11 launches by carrying
  XAUTHORITY through environment hydration and checking the same-user namespace
  init process when it owns the graphical session environment.

Security

• Pinned the release upload GitHub Action to a commit SHA in CI.

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Opened automatically by the release workflow.

[avifenesh]

Opened downstream sync PR: ilysenko/codex-desktop-linux#419

Status: ready for review, all current GitHub checks passed.

This sync carries the v0.2.5 embedded computer-use screenshot payload controls into codex-desktop-linux and opts the relevant workflows into the Node 24 Actions runtime.