* feat(workflows): add stall detection to plan-phase revision loop
Adds issue count tracking and stall detection to the plan-phase
revision loop (step 12). When issue count stops decreasing across
iterations, the loop escalates to the user instead of burning
remaining iterations. The existing 3-iteration cap remains as a
backstop. Uses normalized issue counting from checker YAML output.
Closes#1716
* fix(workflows): add parsing fallback and re-entry guard to stall detection
db6f999ee4