feat: deliver v1.8.0 harness reliability and parity updates

skills/nanoclaw-repl/SKILL.md

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+---
+name: nanoclaw-repl
+description: Operate and extend NanoClaw v2, ECC's zero-dependency session-aware REPL built on claude -p.
+origin: ECC
+---
+
+# NanoClaw REPL
+
+Use this skill when running or extending `scripts/claw.js`.
+
+## Capabilities
+
+- persistent markdown-backed sessions
+- model switching with `/model`
+- dynamic skill loading with `/load`
+- session branching with `/branch`
+- cross-session search with `/search`
+- history compaction with `/compact`
+- export to md/json/txt with `/export`
+- session metrics with `/metrics`
+
+## Operating Guidance
+
+1. Keep sessions task-focused.
+2. Branch before high-risk changes.
+3. Compact after major milestones.
+4. Export before sharing or archival.
+
+## Extension Rules
+
+- keep zero external runtime dependencies
+- preserve markdown-as-database compatibility
+- keep command handlers deterministic and local