fix: [self-heal] apply Ruff formatting to unblock CI format-check gate

[Copilot]

CI run 25490840604 failed in the CI workflow because the format-check step (ruff format --check) reported 10 unformatted files on main.
This PR is a formatting-only correction to align the repository with the enforced Ruff style gate.

• Scope of changes

  • Applied Ruff formatting to the exact files flagged by CI:
    • packages/devcd-core/src/devcd/cli.py
    • packages/devcd-core/src/devcd/slices/ambient_context/service.py
    • packages/devcd-core/src/devcd/slices/events/models.py
    • packages/devcd-core/src/devcd/slices/mcp_server/service.py
    • packages/devcd-core/src/devcd/slices/vision_layer/__init__.py
    • scripts/internal_agentic_benchmark.py
    • tests/test_agentic_context.py
    • tests/test_cli.py
    • tests/test_mcp_server.py
    • tests/test_skill_contract.py

• Change characteristics

  • No behavioral logic updates.
  • No API/schema/contract changes.
  • No dependency or workflow changes.

• Representative formatting delta

  # before
  result = some_call(arg_one, arg_two, arg_three, arg_four)
  
  # after (ruff format)
  result = some_call(
      arg_one,
      arg_two,
      arg_three,
      arg_four,
  )