feat: initial companion repo for OpenClaw vs Claude Code article

40 files demonstrating every major OpenClaw capability using Claude Code:
- 3 agents (researcher, writer, reviewer)
- 3 skills (daily-briefing, slack-message, web-research)
- 2 security hooks (pre-tool-use blocker, post-tool-use logger)
- 10 self-contained examples with copy-paste prompts
- Complete feature map (20 capabilities, 11 full match, 7 different, 2 gap)
- Security docs including NemoClaw comparison
- Automation, messaging, browser, memory documentation

Zero dependencies. Clone and run.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

memory/MEMORY.md

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+# Project Memory
+
+Last updated: [date]
+
+## Notes
+
+This is the project's persistent memory. Add notes here that should persist
+across Claude Code sessions.
+
+CLAUDE.md is for instructions (how Claude should behave, what rules to follow).
+MEMORY.md is for state (what happened, what was decided, what to pick up next).
+
+## Preferences

memory/README.md

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+# Memory System
+
+How Claude Code and OpenClaw handle cross-session persistence.
+
+## Claude Code: File-based memory
+
+Claude Code reads files at session start and writes them back on request.
+
+**Mechanism:**
+- `CLAUDE.md` files at `~/.claude/CLAUDE.md` (global), repo root, and subdirectories
+- Auto-memory: files listed in `CLAUDE.md` under `memory:` are auto-loaded
+- Project files: any file you explicitly tell Claude to read at session start
+- No background process, no indexing, no database
+
+**Properties:**
+- Deterministic: Claude reads exactly what you wrote
+- No semantic search: retrieval is positional, not by meaning
+- Fully transparent: open any file to see what Claude knows
+- Hierarchical: global < project < subdirectory, each level can override
+
+## OpenClaw: Hybrid memory
+
+OpenClaw maintains memory through a combination of structured logs and vector search.
+
+**Mechanism:**
+- Daily markdown logs with structured entries
+- `MEMORY.md` as a curated summary file
+- SQLite-vec or LanceDB for vector storage
+- BM25 + cosine similarity for retrieval (hybrid search)
+
+**Properties:**
+- Semantic search: "find notes about authentication" works even without exact keywords
+- Automatic logging: entries written by the agent during execution
+- Higher complexity: requires a running database
+- Retrieval can surface relevant context not explicitly linked
+
+## Comparison
+
+| Property             | Claude Code         | OpenClaw                  |
+|----------------------|---------------------|---------------------------|
+| Storage              | Plain files         | Files + SQLite/LanceDB    |
+| Retrieval            | Positional/explicit | BM25 + cosine (hybrid)    |
+| Semantic search      | No                  | Yes                       |
+| Setup complexity     | Zero                | Moderate                  |
+| Transparency         | Full                | Partial                   |
+| Cross-session        | Yes (manual)        | Yes (automatic)           |
+
+## Recommendation
+
+For most projects, Claude Code's file-based approach is sufficient. Keep MEMORY.md
+short and curated. Long files degrade quality faster than missing context does.
+
+Use this directory (`memory/`) to store any project state that should outlast a session.