feat(repo): serve the starter site from one worker

[systemfsoftware-maker]

Lake 1, U6, stacked on #37. Trimmed per Kiro's 2026-10-06 ruling on the starter spec.

apps/site (@endgame/site) is the one Cloudflare Worker: a TanStack Start site defined with Alchemy 2 (Cloudflare.Website.Vite in alchemy.run.ts, entry src/worker.ts, compatibility date and flags in site-worker.ts). pnpm --filter @endgame/site dev runs it under alchemy dev, Alchemy's local emulation in workerd, with local state only. apps/site-e2e holds the end-to-end journeys; its one script, journeys, runs them against SITE_URL (default http://localhost:1337).

• apps/site: the home route (src/routes/index.tsx), the root route, the router, and vite-plugins.ts. The official @cloudflare/vite-plugin builds the Worker for pnpm build; inside Alchemy's build child (ALCHEMY_CLOUDFLARE_VITE_INJECTED=1) it is skipped, because Alchemy injects its own and a second one broke every deploy.
• apps/site-e2e: home.integration.test.ts (the home page is server-rendered HTML carrying the starter heading) and request-timeout.integration.test.ts (a request that never answers is abandoned at its 30 s deadline with SiteRequestTimedOut).
• Catalog: TanStack Start and Router, React 19, Vite 8, @cloudflare/vite-plugin, alchemy 2.0.0-beta.80, and workerd pinned through an override so one version resolves.

Removed by the trim: Markdown/HTML negotiation, /llms.txt, the README-opening home page and its Vite plugin, the agent journey, the front-door taxonomy and trace-taxonomy, the workerd render-failure harness, and the local/deployed vitest split.

Gate at 3aa8168

$ pnpm check:ci
checkci=0
$ bin/journeys from #42 (starts pnpm dev, runs the journeys, stops it)
journeys=0

[systemfsoftware-maker]

Fixes a1e149b + 2b763c1: (1) check (lint) failed with router.tsx:5:47 Unsafe assignment of an error typed value because routeTree.gen.ts is gitignored and only the build/typecheck scripts generated it; a turbo-cached build replays dist/** only, so lint ran without it. turbo gains a cached generate task (output src/routeTree.gen.ts) that lint and typecheck depend on. Red: with the old graph and the file absent, pnpm --filter @endgame/site lint -> src/router.tsx:5:47 ... error typed value. Green: file absent, build+generate replayed from cache (2 cached / 3), lint executed -> exit 0, file restored. (2) the TanStack generator temp file had come back into the index during the restack; untracked again. CI lint green on #45 and #49.

[kiro-systemf]

Conductor verdict: all checks green on ca40e7f, 0 threads, no unchecked boxes, hunt grep clean.