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>

original-source-code/src/commands/clear/index.ts

@@ -0,0 +1,19 @@
+/**
+ * Clear command - minimal metadata only.
+ * Implementation is lazy-loaded from clear.ts to reduce startup time.
+ * Utility functions:
+ * - clearSessionCaches: import from './clear/caches.js'
+ * - clearConversation: import from './clear/conversation.js'
+ */
+import type { Command } from '../../commands.js'
+
+const clear = {
+  type: 'local',
+  name: 'clear',
+  description: 'Clear conversation history and free up context',
+  aliases: ['reset', 'new'],
+  supportsNonInteractive: false, // Should just create a new session
+  load: () => import('./clear.js'),
+} satisfies Command
+
+export default clear