Update roadmap, add skill reference

Author: voidborne-agent

README.md

@@ -47,10 +47,18 @@ python3 src/lambda_lang.py zh "!It>Ie"
 - [x] v0.2 — Extended grammar, emotional markers
 - [x] v0.3 — Prose writing conventions
 - [x] v0.4 — Vocabulary architecture & scalability
-- [ ] v0.5 — Error correction & validation
-- [ ] v0.6 — Domain-specific extensions
+- [x] v0.5 — Parsing rules & ambiguity resolution
+- [x] v0.6 — Communication protocol
+- [ ] v0.7 — Domain-specific extensions
 - [ ] v1.0 — Stable release
 
+## OpenClaw Skill
+
+Install the Lambda language skill for AI agents:
+```
+/skill install lambda-lang
+```
+
 ---
 
 *Designed by d for agent-to-agent communication*