Migrate docs to kolay + @universal-ember/docs-support

[NullVoxPopuli-ai-agent]

Replaces the @crowdstrike/ember-oss-docs + docfy docs stack with the universal-ember org's docs setup, following ember-primitives and @universal-ember/table. Verified locally: full turbo build lint test typecheck green across the workspace, and the built site was loaded in a real browser — landing page, kolay nav, shiki-highlighted code, and live demos all work (the yup demo renders validation errors with correct aria on submit; the custom-control demo's id/label wiring and value prefill work).

docs-app

• Now a strict-resolver vite app: @embroider/vite's ember() on (rolldown-)vite 8, ember-source 7, ember-strict-application-resolver, kolay for routing/markdown, @universal-ember/docs-support 0.9.11 for the Shell/PageLayout/IndexPage chrome.
• No tailwind: docs-support ≥0.9.3 dropped its /tailwind export and ships its own styles (this is the ember-primitives shape; table is still on 0.9.2 + tailwind). A ~60-line utility block in app.css covers the demo markup's classes.
• All content ported from docs/ (docfy markdown + separate demo/ folders) into docs-app/src/templates/**/*.gjs.md, with every docfy two-fence demo (hbs template + js component) rewritten as a single live-rendered gjs component. Package names updated throughout (ember-headless-form → @universal-ember/form & friends).
• The ember-changeset demo uses plain validator functions + lookupValidator from validated-changeset — ember-changeset-validations is a v1 addon and can't load in a vite app (prose still points at it for classic apps).
• The docs/ directory is removed; glint-name-error.png moved to public/.

Workspace fallout fixed along the way

• @glimmer/component v1 is fully gone (packages' devDeps → v2; peer ranges already allowed it since Migrate test-app to vite (ember.nvp-style), scenario-test via @embroider/try, drop TS 5.9 #18). Its mere presence in the workspace made pnpm's .pnpm/node_modules fallback hand glint's invokability augmentation a different copy of @glimmer/component than consumers resolve → 18 [Invoke]-missing errors in the addon's own typecheck once docs-app's copy was the last v1. With v1 gone the identity is unambiguous everywhere.
• input.gts/field.gts constructors now type owner as Owner (gc2's constructor signature).
• @babel/plugin-syntax-dynamic-import was a phantom dependency of the packages' rollup builds — provided transitively by the removed crowdstrike/docfy tree; now declared where used.
• docs-app's babel wires @warp-drive/build-config's setConfig (ember-data enters the graph via ember-changeset v5), same as test-app.
• Dropped the now-unneeded @glint/environment-ember-loose peer-ignore rule; added an allowedVersions rule for @glint/template (ember-primitives/ember-repl pin an exact version).

Notes for review

• The Cloudflare Pages projectName is still ember-headless-form — say the word if you want it repointed at a differently-named project.
• pnpm start in docs-app gives the vite dev server; there is no test suite for docs-app (same as table's docs-app effectively — its testem setup was vestigial here).

🤖 Generated with Claude Code