Lab 12 submission

[tdzdslippen]

Goal

Lab 12 (bonus): Moscow-time JSON endpoint as Spin/TinyGo WASM component, perf comparison vs Lab 6 Docker, bonus standalone WASI module under wasmtime.

Changes

• wasm/ — Spin 3.4 http-go scaffold: main.go, spin.toml, go.mod, go.sum, built main.wasm (~360 KiB)
• wasm-cli/ — same logic without Spin SDK, wasmtime run with REQUEST_METHOD/PATH_INFO (~191 KiB)
• submissions/lab12.md — build/curl evidence, perf table, design questions a–j
• artifacts/lab12/ — hyperfine warm runs, cold-start samples, sizes

Testing

• spin build → main.wasm OK
• spin up --listen 127.0.0.1:3000 → curl http://127.0.0.1:3000/time → HTTP 200 JSON
• hyperfine warm: Spin p50 ~10 ms vs Docker /health p50 ~11 ms
• Cold start (5 samples): Spin p50 ~91 ms vs Docker p50 ~155 ms
• Bonus: wasmtime run --env REQUEST_METHOD=GET --env PATH_INFO=/time wasm-cli/main.wasm → 200 + JSON
• Toolchain: Spin 3.4.1, TinyGo 0.41.1, wasmtime 46.0.1, hyperfine 1.20.0

Checklist

• Title ≤ 70 chars
• Commits signed
• submissions/lab12.md updated