P6.1 astroFn GET /app 500 timeout: @astrojs/node standalone mode (listening-server entry, wrong for Lambda) on 3s/128MB. Gates green but deployed Lambda hangs. Fix: middleware mode + timeout/memory bump + deploy-verify.

RESOLVED: switched @astrojs/node standalone -> middleware mode (standalone entry starts a listening server, never returns in Lambda) + astroFn 15s/1024MB. Redeployed. GET /app now 200 real Astro SSR in 1.66s. Root cause + fix confirmed against @astrojs/node source. Lesson: SSR-on-Lambda needs a deploy-verify; gates cannot catch a runtime hang.

FINISH (code done, NOT deployed - controller owns deploy-verify): committed on branch fix/astro-ssr-runtime @ 0f2f4b0. Changes: (1) astro.config.mjs mode standalone->middleware; (2) shim.ts NodeHandler is now (req,res,next), runNodeHandler resolves a 404 on next() so an unmatched route no longer hangs; handler.ts comments updated; (3) astroWebFn timeout 15s + memorySize 1024 (off the 3s/128MB default). Gates GREEN: web vitest 17/17 pass, coverage 100% stmt/branch/func/line (ratchet holds); astro check 0 errors/0 warnings; check-web-build packages dist-lambda OK; root tsc --noEmit clean; infra projects-stack.test.ts 48/48 pass incl new timeout/memory assertion. Did NOT run full root jest by design. Ready for you to deploy + verify GET /app returns 200 live.

PROGRESS: Context7 + installed @astrojs/node@11.1.4 source (dist/server.js, dist/middleware.js, dist/serve-app.js) confirm the middleware entry shape: mode:middleware builds handler = createMiddleware(app, options) -> async (req,res,next,locals). No server start (the auto-start branch is gated on mode===standalone only). createAppHandler: route match -> render + write/end res; no match + next present -> next() with no args, res untouched. Wrote 2 failing shim tests first (next passed on match; next()->404 no-hang; the no-match test literally timed out red = the exact bug). Implemented: NodeHandler now (req,res,next); runNodeHandler resolves a 404 result on next(). Rebuilt dist-lambda: generated entry.mjs exports handler=createMiddleware(...) and declares-but-never-calls startServer at module scope (verified).

START (fix agent): confirmed root cause. web/astro.config.mjs used @astrojs/node mode:standalone; its built server/entry.mjs starts a listening http.Server on module load (meant for node entry.mjs), so the per-invocation handler(req,res) call never returns inside Lambda -> GET /app hangs to the 3s timeout. Plan: switch to mode:middleware (entry exports a plain connect-style handler(req,res,next,locals) with no server start), update the shim to drive next()->404 (no hang) and render->capture, and bump astroWebFn off the 3s/128MB default to 15s/1024MB. TDD: red shim tests first.