Rename the stable bundle to "Agent Zed" (id science.transaction.AgentZed),
emit Agent-Zed-<arch>.dmg with an "Agent Zed" volume, and set the release
channel to stable. The fork's binary is `agent-zed`, so fix the
post-bundle copy and codesign steps in script/bundle-mac that still
referenced the upstream `zed` binary name.
Co-Authored-By: Claude Opus 4.8 <[email protected]>