feat: deliver v1.8.0 harness reliability and parity updates

CHANGELOG.md

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+# Changelog
+
+## 1.8.0 - 2026-03-04
+
+### Highlights
+
+- Harness-first release focused on reliability, eval discipline, and autonomous loop operations.
+- Hook runtime now supports profile-based control and targeted hook disabling.
+- NanoClaw v2 adds model routing, skill hot-load, branching, search, compaction, export, and metrics.
+
+### Core
+
+- Added new commands: `/harness-audit`, `/loop-start`, `/loop-status`, `/quality-gate`, `/model-route`.
+- Added new skills:
+  - `agent-harness-construction`
+  - `agentic-engineering`
+  - `ralphinho-rfc-pipeline`
+  - `ai-first-engineering`
+  - `enterprise-agent-ops`
+  - `nanoclaw-repl`
+  - `continuous-agent-loop`
+- Added new agents:
+  - `harness-optimizer`
+  - `loop-operator`
+
+### Hook Reliability
+
+- Fixed SessionStart root resolution with robust fallback search.
+- Moved session summary persistence to `Stop` where transcript payload is available.
+- Added quality-gate and cost-tracker hooks.
+- Replaced fragile inline hook one-liners with dedicated script files.
+- Added `ECC_HOOK_PROFILE` and `ECC_DISABLED_HOOKS` controls.
+
+### Cross-Platform
+
+- Improved Windows-safe path handling in doc warning logic.
+- Hardened observer loop behavior to avoid non-interactive hangs.
+
+### Notes
+
+- `autonomous-loops` is kept as a compatibility alias for one release; `continuous-agent-loop` is the canonical name.
+
+### Credits
+
+- inspired by [zarazhangrui](https://github.com/zarazhangrui)
+- homunculus-inspired by [humanplane](https://github.com/humanplane)