v0.53.0

bfeae64e ci: build macOS releases on macos-15 (macos-14 runner image is retired)
12dbaa65 release 0.53.0: Codex 6.1 Sol, native Codex skills and structured responses, Codex chat that reads like Claude's, CLI notices and commands in the chat, no-5h-limit usage display, tab title and session search fixes