v1.4.0: Tiered /kas:verify flow

Features

• Tiered verification with early-exit - More efficient review flow
  • Tier 1 (parallel): 5 static analysis agents with early-exit on critical/high/medium issues
  • Tier 2 (if Tier 1 clean): project-reality-manager
  • Tier 3 (if VERIFIED): code-simplifier for optional improvements
• project-reality-manager now runs only after static analysis passes
• code-simplifier runs only on VERIFIED code

Changes

• commands/verify.md - Rewrote with tiered execution model
• README.md - Updated /kas:verify documentation