Feature/lab12 – Submission: Add WASM Spin endpoint

[kujifined]

Goal

Build a QuickNotes-style Moscow time endpoint as a WebAssembly component with Spin, compare it against the Lab 6 Docker baseline, and add a standalone WASI/wasmtime bonus implementation.

Changes

• Added a Spin Go SDK HTTP component in wasm/moscow-time
• Implemented GET /time returning Moscow time JSON with unix, iso, hour_minute, timezone, and utc_offset
• Configured spin.toml with /time routing, TinyGo wasip1 build, -buildmode=c-shared, and allowed_outbound_hosts = []
• Added a standalone WASI CLI implementation in wasm-cli for the bonus task
• Documented tool versions, build/run commands, curl output, artifact sizes, cold-start results, warm latency p50/p95, and design-question answers in submissions/lab12.md

Testing

• spin build
• spin up --listen 127.0.0.1:3000
• curl -s http://127.0.0.1:3000/time | python3 -m json.tool
• tinygo build -o main.wasm -target=wasi -no-debug ./main.go
• wasmtime run --env REQUEST_METHOD=GET --env PATH_INFO=/time main.wasm
• hyperfine --warmup 5 --runs 50 for warm latency measurements
• Collected 5 cold-start samples for both Spin/WASM and the Lab 6 Docker baseline

Checklist

• Title is a clear sentence (≤ 70 chars)
• Commits are signed (git log --show-signature)
• submissions/lab12.md updated