chore(vendor): import pi 1.3.0

Imported as a linear vendor commit so forge rebases do not replay the upstream root tree.

git-subtree-dir: third_party/pi

git-subtree-split: 71023aec1546d6d677a65669c5665c0927ce0dd0

third_party/pi/.pi/prompts/cl.md

@@ -50,5 +50,5 @@ Sections (in order):
 - `### Removed` - Removed features
 
 Attribution:
-- Internal: `Fixed foo ([#123](https://github.com/earendil-works/pi-mono/issues/123))`
-- External: `Added bar ([#456](https://github.com/earendil-works/pi-mono/pull/456) by [@user](https://github.com/user))`
+- Internal: `Fixed foo ([#123](https://github.com/earendil-works/pi/issues/123))`
+- External: `Added bar ([#456](https://github.com/earendil-works/pi/pull/456) by [@user](https://github.com/user))`