fix(pi): add installer and runtime path guidance

README.md

@@ -122,13 +122,26 @@ The repo root now includes a pi package manifest that ships only the pi-specific
 - `scripts/sync-pi-package-skills.sh`
 - `scripts/verify-pi-resources.sh`
 
-Install it into project-local pi settings from this checkout with:
+Install it from a cloned checkout with the repo-owned one-liner:
 
 ```bash
-pi install -l "$(pwd)"
-pi list
+./scripts/install-pi-package.sh --global
 ```
 
+For a project-local install instead:
+
+```bash
+./scripts/install-pi-package.sh --local
+```
+
+Prerequisites:
+
+- Node.js 20+
+- `pi`
+- either `pnpm` on `PATH`, or `corepack` support from the Node install
+
+The repo pins its pnpm version in `package.json` so Corepack-backed installs resolve consistently.
+
 Before publishing or sharing a tarball, run:
 
 ```bash