fix: update packageManager to pnpm@9.15.9 to match lockfileVersion 9.0 in pnpm-lock.yaml

[Copilot]

Every create-release-pr workflow run was silently failing at pnpm install --frozen-lockfile — never reaching the PR creation step — because packageManager: "pnpm@8.15.0" in package.json was incompatible with the lockfileVersion: '9.0' in pnpm-lock.yaml. pnpm 8 ignores lockfile v9 entirely, then --frozen-lockfile aborts with ERR_PNPM_NO_LOCKFILE. This mismatch was introduced by PR #4426 (make-dir upgrade), which regenerated the lockfile with pnpm 9 but didn't update packageManager.

Changes

• package.json — bump packageManager from pnpm@8.15.0 → pnpm@9.15.9. All three workflow files use pnpm/action-setup@v4 without a pinned version, so they pick this up automatically.

• scripts/test-release-automation.js — add Section 7: a regression test that cross-checks the pnpm major version in packageManager against lockfileVersion in pnpm-lock.yaml. Fails loudly if they're incompatible (e.g. lockfile v9 + pnpm 8), so this can't silently recur.

• .github/workflows/create-release-pr.yml — remove the paths: ['packages/**'] trigger filter so the workflow fires on any push to master/alpha, not only commits touching package source files.

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