fix(openclaw): tolerate uninitialized state dir resolver

[YOMXXX]

Summary

• make OpenClaw state-dir resolution tolerate an uninitialized or throwing runtime resolver during plugin registration
• trim runtime and environment fallback values while preserving the existing priority order
• add focused coverage for runtime, env, throwing resolver, and default fallback paths

Verification

• npm test
• npm run build

Fixes #89
Related: #182

[Maxwell-Code07]

Awesome work! 13 fixes in one batch covering Gateway hardening, embedding compatibility, Hermes memory injection, offload stability, and pipeline optimization — a very productive cleanup session 👏

We'll review and merge them one by one 🚀