[claude-do]

Summary

• restore the host-aware branding pipeline across shared, server, and web bootstrap seams
• bring back the branded boot shell, root-scoped manifest/service worker, and standalone mobile Open suppression
• update the fork architecture, acceptance matrix, and enhancement ledger to match the new fresh-upstream seams

Verification

• bun fmt
• bun lint
• bun typecheck
• bun run --cwd packages/shared test src/branding.test.ts
• bun run --cwd apps/server test src/fork/http/brandingRoutes.test.ts src/http.test.ts
• bun run --cwd apps/web test -- src/pwa.test.ts src/runtimeBranding.test.ts src/fork/bootstrap/installForkWebShell.test.ts src/serviceWorkerShellCache.test.ts

Review notes

• reviewed by multiple subagents before push
• fixed follow-up findings around first-paint host branding, shared boot-shell variables, and service-worker cache regression coverage