chore(version): release v5.9.0

feat(assistant): improve mcp page tools (#1326)

fix(starters): use extend in nuxt config (#1328)

fix(layer): do not display edit page if github url missing (#1327)

feat(assistant): accept OIDC or API key (#1323)

feat(layer): add option to force color-mode (#1310)

fix(og): limit description size (#1325)

fix(og): set og image as static (#1324)

chore(deps): update nuxtjs robots to v6

feat(skills): add agent skills discovery via `.well-known` (#1297)

chore(deps): upgrade

feat(ogImage): upgrade to v6 and use primary color (#1312)

docs(syntax): do not use prose comp

docs(deps): remove plausible

chore(deps): upgrade