Align GitHub Actions Bun version with the repo lockfile

[Copilot]

The test GitHub Actions job was failing before build/test execution because CI installed a newer Bun than the repo declares, which caused tracked lockfile drift and tripped the dirty-workspace check.

• Root cause

  • setup-bun in CI was pinned to latest while the repository declares bun@1.3.14 in package.json.
  • bun install under the newer runtime rewrote tracked state, so git diff --exit-code --quiet failed immediately.

• Workflow changes

  • Removed bun-version: latest from the unit-test workflow so oven-sh/setup-bun resolves Bun from the repository’s packageManager.
  • Removed bun-version: latest from the E2E workflow for the same reason, keeping both pipelines consistent.

• Install behavior

  • Updated the unit-test workflow to use a frozen install:

    - uses: oven-sh/setup-bun@v2
    
    - name: Install dependencies
      run: bun install --frozen-lockfile

  • This preserves the existing clean-workspace gate while making lockfile drift fail explicitly instead of mutating the checkout.

• Net effect

  • CI now uses the same Bun version the repository declares.
  • The test job no longer fails on install-induced workspace changes before reaching build and test steps.

[claude]

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