refactor: move bundled skills tree to repo root skills/

- Relocate runtime/skills -> skills/; runtime_skills_root() prefers oclaw/skills
  with fallback to legacy runtime/skills for unmigrated trees.
- session-bootstrap hook handler resolves repo root via PROJECT_ROOT.
- Update architecture/migration docs and in-tree skill references.

Co-authored-by: Cursor <cursoragent@cursor.com>

skills/self-improvement/scripts/error-detector.sh

@@ -0,0 +1,55 @@
+#!/bin/bash
+# 自我改进错误检测 Hook
+# 在 Bash 的 PostToolUse 触发，用于检测命令失败
+# 读取 CLAUDE_TOOL_OUTPUT 环境变量
+
+set -e
+
+# 检查工具输出是否包含错误信号
+# CLAUDE_TOOL_OUTPUT 为工具执行结果
+OUTPUT="${CLAUDE_TOOL_OUTPUT:-}"
+
+# 错误模式（大小写不敏感匹配）
+ERROR_PATTERNS=(
+    "error:"
+    "Error:"
+    "ERROR:"
+    "failed"
+    "FAILED"
+    "command not found"
+    "No such file"
+    "Permission denied"
+    "fatal:"
+    "Exception"
+    "Traceback"
+    "npm ERR!"
+    "ModuleNotFoundError"
+    "SyntaxError"
+    "TypeError"
+    "exit code"
+    "non-zero"
+)
+
+# 检查输出是否匹配任一错误模式
+contains_error=false
+for pattern in "${ERROR_PATTERNS[@]}"; do
+    if [[ "$OUTPUT" == *"$pattern"* ]]; then
+        contains_error=true
+        break
+    fi
+done
+
+# 仅在检测到错误时输出提醒
+if [ "$contains_error" = true ]; then
+    cat << 'EOF'
+<error-detected>
+检测到命令错误。若满足以下任一条件，请记录到 improvement/errors.md：
+- 错误出乎预期或并不直观
+- 需要排查才能解决
+- 可能在相似场景复发
+- 解决方案对后续会话有复用价值
+
+记录时请使用 self-improvement 技能格式：[ERR-YYYYMMDD-XXX]
+</error-detected>
+EOF
+fi