0.5.0: add compact spatial slice, >=90% test coverage, and Pentad synergy

[LucasArmstrong]

Summary of Changes in v0.5.0

• Compact Spatial Slice: Enhanced entity store with bounding-radius spatial filtering and compact JSON serialization for System 1 fast decisions.
• Test Coverage: Achieved >=90% test coverage across Statements (93.99%), Lines (94.35%), and Functions (95.85%) with 251/251 passing tests.
• Multi-Node Matrix Testing: Verified npm run test:matrix passing across Node.js 18, 20, and 22 (753 total test executions).
• Audit & Governance: 0 npm audit vulnerabilities, documentation and manifest synchronization.