Fifty-two runnable concept bundles taking a reader from Go foundations to expert internals, then through
the standard library and production patterns. Each is a .go (ground truth) +
.md guide; every value is printed by the .go — never hand-computed.
Run any with just run <name>.
Built subagent-per-bundle (max 4/batch) and verified via just sweep — 1198 checks, 0 failures, all 10 concurrency bundles -race clean.
Tailwind Play CDN needs internet to style.