Adds openclaw-cpp/, a C++20 port of the TypeScript OpenClaw project that mirrors the same folder structure, file names, and CLI usage as the original src/ tree.

Summary

• Problem: No C++ equivalent of the OpenClaw CLI exists.
• Why it matters: Enables deployment in environments where Node.js is unavailable or a native binary is preferred.
• What changed: New openclaw-cpp/ directory with CMake build system, fully implemented core modules, stub pairs for all remaining subsystems, and unit tests mirroring the *.test.ts pattern.
• What did NOT change: The TypeScript source tree is untouched; this is additive only.

Core modules (fully implemented)

68+ stub .hpp/.cpp pairs cover every remaining sub-module (acp, agents, channels, commands, config, gateway, providers, etc.) with matching public API signatures ready to fill in.

Build

# From openclaw-cpp/
cmake -B build -DCMAKE_BUILD_TYPE=Release
cmake --build build -j$(nproc)

./build/bin/openclaw --version   # 0.0.0 (resolves from package.json at runtime)
./build/bin/openclaw --help      # lists all 17 commands
./build/bin/openclaw agent       # stub: "not yet implemented in C++ port"

Dependency mapping: commander → CLI11, JSON.parse → nlohmann/json, node-fetch → cpp-httplib, pino → spdlog, fs/path → std::filesystem. All vendored as header-only; cmake downloads them automatically on first configure.

Change Type (select all)

• Bug fix
• Feature
• Refactor
• Docs
• Security hardening
• Chore/infra

Scope (select all touched areas)

• Gateway / orchestration
• Skills / tool execution
• Auth / tokens
• Memory / storage
• Integrations
• API / contracts
• UI / DX
• CI/CD / infra

Linked Issue/PR

• Related #

User-visible / Behavior Changes

New openclaw native binary buildable from openclaw-cpp/ via CMake. CLI surface (commands, flags, help text) is identical to the TypeScript version. No changes to the existing TypeScript CLI.

Security Impact (required)

• New permissions/capabilities? No
• Secrets/tokens handling changed? No
• New/changed network calls? No
• Command/tool execution surface changed? No
• Data access scope changed? No

Repro + Verification

Environment

• OS: Linux (Ubuntu 24.04)
• Runtime/container: GCC 13, CMake 3.31
• Model/provider: N/A
• Integration/channel (if any): N/A
• Relevant config (redacted): N/A

Steps

1. cd openclaw-cpp && cmake -B build && cmake --build build
2. ./build/bin/openclaw -v
3. ./build/bin/openclaw --help
4. ./build/bin/openclaw agent

Expected

• -v / -V prints version string
• --help lists all 17 commands
• agent dispatches to stub handler

Actual

• All three behave as expected; unknown commands exit 1 with a clear message.

Evidence

• Build completes with zero errors, zero warnings on GCC 13 -Wall -Wextra -Wpedantic
• CodeQL scan: 0 alerts
• Unit tests compile and pass for: version, argv, utils, infra/env, infra/errors, infra/ports

Human Verification (required)

• Verified scenarios: --help, -v, -V, agent, config set, unknown command, --no-color
• Edge cases checked: argv with root-level flags before command name; shouldForceReadOnlyAuthStore with secrets audit
• What you did not verify: actual gateway/channel functionality (all stubs); Windows build

Compatibility / Migration

• Backward compatible? Yes — additive only, no existing files changed
• Config/env changes? No
• Migration needed? No

Failure Recovery (if this breaks)

• How to disable/revert this change quickly: Delete openclaw-cpp/ directory entirely; no other files were modified.
• Files/config to restore: None
• Known bad symptoms reviewers should watch for: CMake download failures for vendored headers (handled gracefully with stub fallbacks)

Risks and Mitigations

• Risk: Stub implementations silently no-op instead of erroring — callers may not notice unimplemented features.
  • Mitigation: Each stub prints "not yet implemented in C++ port" to stdout so it is obvious at runtime.

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