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/memory/__init__.py

@@ -0,0 +1,86 @@
+"""Memory package for nano-claude-code.
+
+Provides persistent, file-based memory across conversations.
+
+Storage layout:
+  user scope    : ~/.nano_claude/memory/<slug>.md   (shared across projects)
+  project scope : .nano_claude/memory/<slug>.md     (local to cwd)
+
+The MEMORY.md index in each directory is auto-maintained and injected
+into the system prompt so Claude has an overview of available memories.
+
+Public API (backward-compatible with the old memory.py module):
+  MemoryEntry      — dataclass for a single memory
+  save_memory()    — write/update a memory file
+  delete_memory()  — remove a memory file
+  load_index()     — load all entries from one or both scopes
+  search_memory()  — keyword search across entries
+  get_memory_context() — MEMORY.md content for system prompt injection
+"""
+from .store import (  # noqa: F401
+    MemoryEntry,
+    save_memory,
+    delete_memory,
+    load_index,
+    load_entries,
+    search_memory,
+    get_index_content,
+    parse_frontmatter,
+    USER_MEMORY_DIR,
+    INDEX_FILENAME,
+    MAX_INDEX_LINES,
+    MAX_INDEX_BYTES,
+)
+from .scan import (  # noqa: F401
+    MemoryHeader,
+    scan_memory_dir,
+    scan_all_memories,
+    format_memory_manifest,
+    memory_age_days,
+    memory_age_str,
+    memory_freshness_text,
+)
+from .context import (  # noqa: F401
+    get_memory_context,
+    find_relevant_memories,
+    truncate_index_content,
+)
+from .types import (  # noqa: F401
+    MEMORY_TYPES,
+    MEMORY_TYPE_DESCRIPTIONS,
+    MEMORY_SYSTEM_PROMPT,
+    WHAT_NOT_TO_SAVE,
+)
+
+__all__ = [
+    # store
+    "MemoryEntry",
+    "save_memory",
+    "delete_memory",
+    "load_index",
+    "load_entries",
+    "search_memory",
+    "get_index_content",
+    "parse_frontmatter",
+    "USER_MEMORY_DIR",
+    "INDEX_FILENAME",
+    "MAX_INDEX_LINES",
+    "MAX_INDEX_BYTES",
+    # scan
+    "MemoryHeader",
+    "scan_memory_dir",
+    "scan_all_memories",
+    "format_memory_manifest",
+    "memory_age_days",
+    "memory_age_str",
+    "memory_freshness_text",
+    # context
+    "get_memory_context",
+    "find_relevant_memories",
+    "truncate_index_content",
+    # types
+    "MEMORY_TYPES",
+    "MEMORY_TYPE_DESCRIPTIONS",
+    "MEMORY_SYSTEM_PROMPT",
+    "WHAT_NOT_TO_SAVE",
+]