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/tui/native/win32/README.md

@@ -1,16 +1,16 @@
 # Windows native prebuilds
 
-Build both Windows architectures from the repository root:
+Provides console input setup, modifier-key state, and asynchronous text/image clipboard access. Links to `kernel32` and `user32`; no Node headers are required.
+
+## Building
+
+On Windows, install Visual Studio's "Desktop development with C++" workload, then run from the repository root to build x64 and arm64:
 
 ```sh
 npm --prefix packages/tui run build:native:win32
 ```
 
-On Windows, the build uses the Microsoft C++ Build Tools from Visual Studio. `build.mjs` locates `VsDevCmd.bat`, initializes a developer environment for `amd64` and `arm64`, and builds the addon with `cl.exe`/`link.exe`.
-
-Install the "Desktop development with C++" workload, or at minimum the MSVC toolset and Windows SDK components. No Node headers are required; the addon resolves N-API symbols from the host process.
-
-For non-Windows cross-builds, or for custom Windows toolchains, set `PI_TUI_WIN32_TOOLCHAIN=mingw` and provide MinGW-compatible compilers:
+For cross-builds or custom toolchains, provide MinGW-compatible compilers:
 
 ```sh
 PI_TUI_WIN32_TOOLCHAIN=mingw \
@@ -19,4 +19,13 @@ CC_ARM64=/path/to/aarch64-w64-mingw32-gcc \
 npm --prefix packages/tui run build:native:win32
 ```
 
-The addon intentionally avoids the C runtime and links only against `kernel32`.
+## Testing clipboard writes
+
+On a Windows test desktop, run from `packages/tui` in PowerShell:
+
+```powershell
+$env:PI_TEST_NATIVE_CLIPBOARD = "1"
+node --test test/native-platform.test.ts
+```
+
+This opt-in test checks native text writes and reads. **It replaces the system clipboard contents.**