feat: establish generated v2 foundation

[anand-testcompare]

Summary

• add an Nx/pnpm 11/TanStack Start v2 foundation with Cloudflare Worker build/deploy config
• add generated diagram-core, diagram-renderer, diagram-studio-ui, sketchi-generators, diagram-agent-tools, diagram-exporter, and mcp-server packages
• make diagram-core the canonical IntermediateFormat schema boundary, with the backend reusing that shared schema instead of carrying its own duplicate zod contract
• add diagram-agent-tools as the host-neutral diagram tool catalog with MCP-shaped JSON schemas, descriptions, routing hints, and session-aware diagram_to_png input
• add diagram-exporter as the host-neutral Excalidraw share/file parsing, safe output path, and Playwright-backed PNG export package
• wire the OpenCode sketchi-diagram agent config/hints and standalone diagram_to_png flow to shared packages instead of duplicating tool names, Mermaid guardrails, and PNG export logic
• add @sketchi/mcp-server as a generic NodeNext MCP stdio adapter over the shared catalog, with a default HTTP executor for Sketchi server-backed generation/edit APIs plus shared PNG export
• keep host-owned visual grading explicit in the MCP executor contract instead of hiding partial behavior
• generate flowchart and architecture diagram types through the local Nx generator with EJS templates and registry updates
• add Storybook stories/tests for generated diagram/component surfaces, plus a test-storybook target that verifies indexed static stories
• use TanStack Router search params, Query, Virtual, and Hotkeys in the app/workspace path instead of hand-rolled app-state wiring
• add route-level proof that ?diagram= controls the selected diagram and catalog clicks update the TanStack Router search state
• add a generated DiagramStatusStrip Studio component and a structure guard requiring component file, test, Storybook story, local export, and package export
• add Nx-visible backend, MCP, and exporter dependency/typecheck wiring so affected graphs and focused package commands include their dependencies
• fix composite TypeScript project-reference outputs so clean CI run-many -t typecheck,test,build runs do not race against missing dist/typecheck declarations
• remove the stale Next/Vercel/Bun/Turbo web and CI surface so the TanStack/Cloudflare path is the active app path

Verification

• pnpm install --frozen-lockfile
• git diff --check
• bun x ultracite fix
• NX_DAEMON=false pnpm nx test diagram-exporter --skip-nx-cache (4 files, 14 tests)
• NX_DAEMON=false pnpm nx typecheck diagram-exporter --skip-nx-cache
• NX_DAEMON=false pnpm nx build diagram-exporter --skip-nx-cache
• NX_DAEMON=false pnpm nx run diagram-exporter:typecheck-tsgo --skip-nx-cache
• NX_DAEMON=false pnpm nx test diagram-agent-tools --skip-nx-cache (1 file, 4 tests)
• NX_DAEMON=false pnpm nx test mcp-server --skip-nx-cache (2 files, 9 tests)
• NX_DAEMON=false pnpm nx typecheck mcp-server --skip-nx-cache
• NX_DAEMON=false pnpm nx build mcp-server --skip-nx-cache
• NX_DAEMON=false pnpm nx run mcp-server:typecheck-tsgo --skip-nx-cache
• timeout 2 node packages/mcp-server/dist/stdio.js </dev/null
• cd packages/opencode-excalidraw && bun test (32 tests)
• cd packages/opencode-excalidraw && bun x tsc -p tsconfig.ci.json --noEmit && bun run build
• NX_DAEMON=false pnpm nx test web --skip-nx-cache (1 file, 2 tests)
• NX_DAEMON=false pnpm nx typecheck web --skip-nx-cache
• NX_DAEMON=false pnpm nx build web --skip-nx-cache
• NX_DAEMON=false pnpm nx run web:typecheck-tsgo --skip-nx-cache
• rm -rf packages/diagram-core/dist packages/diagram-renderer/dist packages/diagram-studio-ui/dist packages/diagram-agent-tools/dist packages/diagram-exporter/dist packages/mcp-server/dist apps/web/dist tools/sketchi-generators/dist && NX_DAEMON=false pnpm nx run-many -t typecheck,test,build --skip-nx-cache (10 projects)
• NX_DAEMON=false pnpm nx run-many -t typecheck-tsgo --skip-nx-cache (7 projects)
• NX_DAEMON=false pnpm nx test-storybook diagram-studio-ui --skip-nx-cache verified 7 source story files across 11 static Storybook stories
• pnpm exec wrangler deploy --dry-run --config dist/server/wrangler.json
• NX_DAEMON=false pnpm nx graph --affected --file=.memory/nx-affected-diagram-exporter.html
• NX_DAEMON=false pnpm nx graph --affected --file=.memory/nx-affected-router-search.html
• pnpm dev reached Vite ready on http://127.0.0.1:5174/; agent-browser smoke opened /?diagram=flowchart, saw the flowchart prompt, clicked Architecture, and verified the URL changed to /?diagram=architecture

Notes

• The pnpm dev failure on old main happens because that branch stores catalog entries under package.json > workspaces.catalog; pnpm expects catalogs in pnpm-workspace.yaml. This v2 branch has the pnpm workspace file and pnpm dev starts cleanly.
• diagram_grade remains host-owned because it depends on the OpenCode LLM client; diagram_to_png is now available in the generic MCP default executor through @sketchi/diagram-exporter.
• The MCP stdio entrypoint is intentionally NodeNext-shaped and was runtime-smoked from built dist; this caught and fixed extensionless ESM imports before push.
• The PR-only component-contract hardening was reverted in 2ecee2d; that work is moving to /home/anandpant/Development/shpitdev/sketchi-v2-lab.
• Current pushed SHA: 2ecee2d.