Add typedoc and typedoc-plugin-markdown as devDependencies. Add typedoc.json config
targeting src/index.ts with markdown output to .github/wiki/api. Add docs script to
package.json. Generate initial API reference pages.
Part of T-E8-03 — TypeDoc automation for all 12 JS/TS packages.
- Trim README to ≤80 lines with wiki link for full docs
- Add CHANGELOG.md documenting v3.0.0 breaking change (peer-dep migration)
- Add .github/wiki pages: _Sidebar, _Footer, Contributing, SECURITY, CODE_OF_CONDUCT
