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/packages/coding-agent/examples/README.md

@@ -1,6 +1,16 @@
 # Examples
 
-Example code for pi-coding-agent SDK and extensions.
+Example code for the pi-coding-agent SDK, process integration, and extensions.
+
+## CLI integration
+
+[`rpc-client.ts`](rpc-client.ts) uses the typed `RpcClient` to run Pi in a child process, stream events, and wait for the run to settle.
+
+Build the coding-agent package before running it from a repository checkout:
+
+```bash
+node examples/rpc-client.ts "Explain this repository"
+```
 
 ## Directories
 
@@ -18,11 +28,9 @@ Example extensions demonstrating:
 - External integrations (SSH, file watchers, system theme sync)
 - Custom providers (Anthropic with custom streaming, GitLab Duo)
 
-### [plugins/pi-example-plugin/](plugins/pi-example-plugin/)
-An experimental plugin package that Pi automatically builds into separate Session-worker and TUI Chord facets.
-
 ## Documentation
 
-- [SDK Reference](sdk/README.md)
+- [SDK Examples](sdk/README.md)
+- [CLI Integration](../docs/cli-integration.md)
 - [Extensions Documentation](../docs/extensions.md)
 - [Skills Documentation](../docs/skills.md)