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