Update DevLoopWorkflow to use PhaseOps I/O methods

[devloop-bot]

Parent

Parent: #196

What to build

Remove _WorkflowCommon from DevLoopWorkflow inheritance and migrate all I/O calls to use PhaseOps methods. DevLoopWorkflow should inherit only PhaseOps.

This consolidates the I/O seam so that all comment, dispatch, cleanup, reviewer, and KPI operations flow through a single protocol — PhaseOps. The workflow behavior must remain identical; only the code path changes (no more multiple inheritance).

Acceptance criteria

• DevLoopWorkflow inherits only from PhaseOps (not _WorkflowCommon)
• All _comment, _dispatch, _cleanup, _request_reviewer, _emit_kpis calls use PhaseOps methods
• DevLoopWorkflow code paths exercise the new PhaseOps methods end-to-end
• All existing tests still pass
• CI pipeline still works through DevLoopWorkflow

Blocked by

• Merge _WorkflowCommon I/O methods into PhaseOps #197 (Merge _WorkflowCommon I/O methods into PhaseOps)

[devloop-bot]

⏳ queued — agent is working on this issue

[devloop-bot]

✅ Implemented — PR: agent/issue-198-update-devloopworkflow-to-use-phaseops-i-o-methods

[devloop-bot]

⏳ queued — agent is reviewing this issue

[devloop-bot]

🔎 Reviewed #198 — verdict: lgtm.