feat: initial agent-builder plugin (v0.1.0)

Build complete autonomous agent systems with Claude Code.
7-phase guided workflow: map work, CLAUDE.md, agent team,
pipeline, security, deployment, test.

Components:
- commands/build.md: main guided workflow
- agents/builder.md: scaffolding agent
- skills/agent-system-design: architecture knowledge + 4 references
- scripts/templates: hooks, automation, launchd, systemd

Covers 22 OpenClaw capabilities across 4 deployment targets
(local, Mac Mini, VPS, Managed Agents).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

scripts/templates/post-tool-use.sh

@@ -0,0 +1,19 @@
+#!/bin/bash
+# PostToolUse hook: Log all tool executions to an audit trail.
+#
+# Appends a timestamped entry to hooks/audit.log for every tool call.
+# Useful for reviewing what Claude Code did during a session.
+#
+# Customize: Change log_file path or add filtering logic.
+
+input=$(cat)
+tool_name=$(echo "$input" | python3 -c "import sys,json; print(json.load(sys.stdin).get('tool_name',''))" 2>/dev/null)
+tool_input=$(echo "$input" | python3 -c "import sys,json; d=json.load(sys.stdin).get('tool_input',{}); print(d.get('command', d.get('file_path', d.get('pattern', str(d)[:100])))" 2>/dev/null)
+
+timestamp=$(date -u +"%Y-%m-%dT%H:%M:%SZ")
+log_dir="$(dirname "$0")"
+log_file="$log_dir/audit.log"
+
+echo "$timestamp | $tool_name | $tool_input" >> "$log_file"
+
+exit 0