Use Pi for Dashboard Language Specification Review

[Copilot]

The daily dashboard specification review failed before execution because its Codex runtime required an unset COPILOT_GITHUB_TOKEN. The workflow is updated to use Pi with GitHub Copilot request authorization.

• Workflow runtime
  • Replace engine: codex with Pi using copilot/gpt-5.4.
  • Grant copilot-requests: write.

permissions:
  contents: read
  copilot-requests: write
  issues: read

engine:
  id: pi
  model: copilot/gpt-5.4

• Generated workflow

  • Regenerate the checked-in lock file for Pi runtime configuration.

• Regression coverage

  • Add a contract test asserting the Pi engine and required permission.

• Fixes [aw] Daily Dashboard Language Specification Review failed #52