Update README.MD and add nano-claude-code v3.0 + original-source-code/src

- README.MD: add original-source-code and nano-claude-code sections, update
  overview table (4 subprojects), add v3.0 news entry, expand comparison table
  with memory/multi-agent/skills dimensions
- nano-claude-code v3.0: multi-agent package (multi_agent/), memory package
  (memory/), skill package (skill/) with built-in /commit and /review skills,
  context compression (compaction.py), tool registry plugin system, diff view,
  17 slash commands, 18 built-in tools, 101 tests (~5000 lines total)
- original-source-code/src: add raw TypeScript source tree (1884 files)

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

nano-claude-code/config.py

@@ -16,6 +16,9 @@ DEFAULTS = {
     "thinking":         False,
     "thinking_budget":  10000,
     "custom_base_url":  "",       # for "custom" provider
+    "max_tool_output":  32000,
+    "max_agent_depth":  3,
+    "max_concurrent_agents": 3,
     # Per-provider API keys (optional; env vars take priority)
     # "anthropic_api_key": "sk-ant-..."
     # "openai_api_key":    "sk-..."