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/.gitignore

@@ -1,4 +1,4 @@
-node_modules/
+node_modules
 dist/
 .artifacts/
 *.log
@@ -37,6 +37,8 @@ out.jsonl
 pi-*.html
 out.html
 packages/coding-agent/binaries/
+packages/env/bin/
+packages/env/daemon/target/
 todo.md
 plans/
 .pi/hf-sessions/