fix: address review feedback — PATH ordering and regex anchoring

- Swap addPath order so pnpmHome (with pnpm.exe) is prepended last
  and has highest precedence over pnpmHome/bin.
- Anchor version regex with $ and allow prerelease suffixes.

.github/workflows/test.yaml

@@ -36,7 +36,7 @@ jobs:
         run: |
           actual="$(pnpm --version)"
           echo "pnpm version: ${actual}"
-          if [[ ! "${actual}" =~ ^[0-9]+\.[0-9]+\.[0-9]+ ]]; then
+          if [[ ! "${actual}" =~ ^[0-9]+\.[0-9]+\.[0-9]+(-.+)?$ ]]; then
             echo "ERROR: pnpm --version did not produce valid output"
             exit 1
           fi
@@ -81,7 +81,7 @@ jobs:
         run: |
           actual="$(pnpm --version)"
           echo "pnpm version: ${actual}"
-          if [[ ! "${actual}" =~ ^[0-9]+\.[0-9]+\.[0-9]+ ]]; then
+          if [[ ! "${actual}" =~ ^[0-9]+\.[0-9]+\.[0-9]+(-.+)?$ ]]; then
             echo "ERROR: pnpm --version did not produce valid output"
             exit 1
           fi
@@ -115,7 +115,7 @@ jobs:
         run: |
           actual="$(pnpm --version)"
           echo "pnpm version: ${actual}"
-          if [[ ! "${actual}" =~ ^[0-9]+\.[0-9]+\.[0-9]+ ]]; then
+          if [[ ! "${actual}" =~ ^[0-9]+\.[0-9]+\.[0-9]+(-.+)?$ ]]; then
             echo "ERROR: pnpm --version did not produce valid output"
             exit 1
           fi
@@ -220,7 +220,7 @@ jobs:
         run: |
           actual="$(pnpm --version)"
           echo "pnpm version: ${actual}"
-          if [[ ! "${actual}" =~ ^[0-9]+\.[0-9]+\.[0-9]+ ]]; then
+          if [[ ! "${actual}" =~ ^[0-9]+\.[0-9]+\.[0-9]+(-.+)?$ ]]; then
             echo "ERROR: pnpm --version did not produce valid output"
             exit 1
           fi

src/install-pnpm/run.ts

@@ -40,12 +40,13 @@ export async function runSelfInstaller(inputs: Inputs): Promise<number> {
   const pnpmHome = standalone && process.platform === 'win32'
     ? path.join(dest, 'node_modules', '@pnpm', 'exe')
     : path.join(dest, 'node_modules', '.bin')
+  // pnpm expects PNPM_HOME/bin in PATH for global binaries (e.g. node
+  // installed via `pnpm runtime`). Add it first so the next addPath
+  // (pnpmHome itself, which contains pnpm.exe) has higher precedence.
+  addPath(path.join(pnpmHome, 'bin'))
   addPath(pnpmHome)
   exportVariable('PNPM_HOME', pnpmHome)
 
-  // pnpm expects PNPM_HOME/bin in PATH for global binaries
-  addPath(path.join(pnpmHome, 'bin'))
-
   // Ensure pnpm bin link exists — npm ci sometimes doesn't create it
   if (process.platform !== 'win32') {
     const pnpmBinLink = path.join(dest, 'node_modules', '.bin', 'pnpm')