Sprint 228 Plan: Spec Readiness Scoring

Goal

Make spec-to-execution readiness measurable before taskitem generation.

Step 2179: Add markdown spec readiness assessor with deterministic section/keyword checks.
Step 2180: Emit missing-action list for execution blockers.
Step 2181: Emit recommended spec template blocks for missing sections.
Step 2182: Run readiness baseline on current challenging spec docs.
Step 2183: Add Sprint228IntegrationSummary.h.