Update from code changes: Pi explicit push and sync lifecycle

[mintlify]

Summary

Rewrite the Pi coding agent guide to teach the new explicit /celesto push + /celesto sync lifecycle, since Pi no longer auto-uploads on connect or auto-syncs on exit.

Changes

• Rewrote the Run Pi remotely steps to note that $HOME/workspace starts empty, added a new Push your project to the computer step, and clarified that sync requires a prior push.
• Added an Explicit push and sync lifecycle section covering push-once semantics, remote-first work, and single-transfer serialization.
• Updated What runs locally and remotely to reflect that files only reach the remote workspace after an explicit push.
• Rewrote Control computer cleanup so it makes clear that exit deletes the computer without syncing and that keeping the computer still requires the user to run /celesto sync for a local copy.
• Updated the Pi commands reference to include /celesto push and revised descriptions of sync and keep.
• Refreshed Reuse an existing Celesto computer and the exclusion section to describe explicit transfers, and added troubleshooting entries for push refusals from root/home, missing shared revisions, and concurrent transfers. Removed the obsolete "final synchronization failed" entry.

Context

Follows the source change that requires explicit Pi workspace transfers (celestoai/sdk#37).

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Project	Status	Preview	Updated (UTC)
CelestoAI	🟢 Ready	View Preview	Jul 17, 2026, 9:51 AM

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Project	Status	Preview	Updated (UTC)
CelestoAI	🟡 Building	–	Jul 17, 2026, 9:50 AM