Create scheduled release PR workflow

[lawrencecchen]

Summary

• replace the daily release workflow with a scheduled job that bumps the client version and opens a draft release PR instead of pushing directly to main
• run the release preparation twice daily at 4:30 AM and 7:00 PM PST, keeping version bumps aligned with the latest tag

Testing

• not run (workflow change only)

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Codex Task

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Project	Deployment	Preview	Comments	Updated (UTC)
cmux-client	Ready	Preview	Comment	Nov 25, 2025 3:59am
cmux-www	Ready	Preview	Comment	Nov 25, 2025 3:59am

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Avoid pre-committing version bump before create-pull-request

When changes are detected, the workflow commits the bumped apps/client/package.json itself (git commit in the preceding step) and then calls peter-evans/create-pull-request. That action only opens a PR when there are uncommitted workspace changes; if the working tree is already clean it logs “no changes” and exits without creating or updating a PR. Because the version bump is pre-committed, every run will hit the clean-tree path and the scheduled release PR will never be opened despite the version change. Let the action create the commit instead of doing it manually.

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