feat: add .codex-plugin/plugin.json manifest for awesome-codex-plugins listing

fix(evals/nav): mobile hamburger menu for small screens

fix(nav): mobile hamburger menu for small screens

docs(contributing): replace agents references with skills

fix(install): correct Claude Code install commands in README and landing page

feat(landing): move /research to first card; move /using-co-researcher to install section

chore: bump version to 2.1.0; add using-co-researcher to README; fix landing page count and copy

seo: update meta tags, og:image, fix evals canonical/og:url, add twitter+json-ld to evals

fix(copy): accurate honesty claim — structural constraint, not instruction-independent

fix(landing): add missing Academic Writing and Multi-Source Investigation skills; fix count to fifteen

fix(landing): correct skill commands — remove 6 fake tags, keep 8 real slash commands only

feat(seo): robots.txt, sitemap, JSON-LD, Twitter Card, llms-full.txt; punch hero copy; fix evals title

copy(landing): rewrite for researcher audience — method framing, active voice, no AI-isms

fix(evals): move nav outside container so it spans full width

fix(evals): make nav sticky (always visible, not hide-on-scroll)