Three planner variants (per-pad clamp ranges, route rewrites, edge-ring feasibility) failed strict validation or found no feasible lower pad on the FI fast fixture; the clamp stamp itself was never evaluated. Source restored. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_016dhxM43dnWvUu2B5Ph1iG1