feat: agent-readiness - 6 native plugins, MCP server, full docs (agen…

[bugra9]

…t + human)

Native agent plugins (single source of truth at cppjs-agents/):

• Claude Code, Cursor 2.5+, OpenAI Codex CLI, GitHub Copilot CLI, Google Gemini CLI, OpenCode — per-client manifests + per-repo marketplace registries (.claude-plugin/, .cursor-plugin/, .agents/, .github/plugin/), shared skills/ + commands/, .mcp.json reference.
• 4 auto-trigger skills (recommend, integrate, package, runtime-api), 3 slash commands (/cppjs-integrate, /cppjs-package, /cppjs-bug-fix).
• Per-client install docs in sidebar at /docs/agent/install/{client}.

@cpp.js/mcp server (cppjs-core/cppjs-mcp/):

• 9 typed tools: recommend, list_packages, detect_framework, get_api_reference, scaffold_package, build_package, check_native_versions, doctor, cloud_build_package.

Universal fallbacks:

• AGENTS.md / GEMINI.md / .github/copilot-instructions.md snippets.
• npm skills CLI integration (50+ agents: Cline, Continue, Windsurf, Warp, …) — single-quoted runtime-api YAML to satisfy strict parsers.

Agent-facing docs (docs/):

• 12 Runtime/Config API docs (init, cppjs-config, cppjs-build, filesystem, threading, cpp-binding-rules + _JSPI suffix, swig-escape, build-state, overrides catalog, troubleshooting, performance, lifecycle-and-types).
• 10 integration playbooks + new-package, bug-fix, code-review, recommend-cppjs, verify-install.
• 4 ADRs.

Website (cpp.js.org):

• New Agent section with 9-entry Install sidebar (overview + 6 clients
  • MCP + Skills CLI + AGENTS.md snippet).
• llms.txt + llms-full.txt (~302 KB, 47 sources) — auto-built from canonical markdown via prebuild hook chain.
• Hero buttons simplified (For Developers / For AI Agents); navbar reorganized.

Human-facing docs port (gap analysis from agent docs):

• New: guide/troubleshooting, api/configuration/{threading,overrides, performance,build-hooks}, api/cpp-bindings/swig-escape.
• Updated: api/javascript/filesystem (decision tree + per-runtime sheet), api/cpp-bindings/overview (5 binding rules + wrapper pattern + JSPI naming convention).
• Production COOP/COEP cross-link added to vite/webpack/rspack/rollup integration guides.

Other:

• 5 new package docs (curl, jpegturbo, lerc, openssl, zstd).
• Vitest tests for cpp.js core utilities.
• scripts/{detect-framework,doctor.sh,scaffold-package,help}.