[adampeterhiggins]

Summary

• Adds a Checkout context source, separate from Repository (which clones on send). Type # and use the Checkouts tab, or choose Checkout from the paperclip menu (the + menu on mobile).
• Enter inserts a chip for that message. Command-Enter, or the picker's checkbox, also links the checkout to the thread. Linked checkouts show in Thread Details and are included in later turns. Claude is given the folder; other providers receive the path.
• The list is project roots and T3 worktrees the environment already knows, plus a pasted path. It does not scan the disk. A checkout on another connected machine is listed and cannot be selected.

Test plan

• Type # and a folder name and confirm Checkouts opens with name, branch, path, and change count
• Command-Enter links the checkout; Enter only inserts the chip
• Paperclip → Checkout uses the same columnar picker, including "Also link to thread"
• Hover the sent chip and confirm path, branch, HEAD, changes, and agent access
• Thread Details lists the link, unlinks it, and Locate refuses a different repository
• On mobile, + → Checkout attaches a chip
• A checkout on another environment is visible and cannot be selected

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