feat: ArcheFlow — multi-agent orchestration plugin for Claude Code

Zero-dependency Claude Code plugin using Jungian archetypes as
behavioral protocols for multi-agent orchestration.

- 7 archetypes (Explorer, Creator, Maker, Guardian, Skeptic, Trickster, Sage)
- ArcheHelix: rising PDCA quality spiral with feedback loops
- Shadow detection: automatic dysfunction recognition and correction
- 3 built-in workflows (fast, standard, thorough)
- Autonomous mode: unattended overnight sessions with full visibility
- Custom archetypes and workflows via markdown/YAML
- SessionStart hook for automatic bootstrap
- Examples for feature implementation and security review

hooks/hooks.json

@@ -0,0 +1,16 @@
+{
+  "hooks": {
+    "SessionStart": [
+      {
+        "matcher": "startup|clear|compact",
+        "hooks": [
+          {
+            "type": "command",
+            "command": "\"${CLAUDE_PLUGIN_ROOT}/hooks/session-start\"",
+            "async": false
+          }
+        ]
+      }
+    ]
+  }
+}