Adds `openstatus check <URL>` (alias `c`): a top-level, unauthenticated command that runs a one-shot HTTP check from 28 global regions via the public OpenStatus speed checker. Highlights: - Live row-per-region output streaming as NDJSON arrives, followed by a summary footer (fastest/slowest/mean/success-rate + share URL). - --timing adds DNS / Connection / TLS / TTFB / Transfer columns. - --json buffers a single object with full timing nested per region, ready for jq pipelines. - curl-style flags -X / -H / -d (with @file and @- stdin support). - Typed errors for 429 (parsed Retry-After + body reset fallback), 4xx (with VPN/proxy hint when body mentions client IP), 5xx, network errors, and truncated streams. - Region codes mapped to human-readable names (e.g. koyeb_tyo → "Tokyo (Koyeb)") from the upstream skill repo snapshot. Internals: - New internal/check/ package: client.go (NDJSON streaming parser), render.go (table + summary + JSON output), regions.go (display names), types.go (typed errors). - internal/api/client.go gains PlayCheckerURL pinned to www.openstatus.dev (skips a 308 redirect on every call). - Tests use the existing RoundTripper-interceptor pattern from internal/run/run_test.go; fixtures captured from live probes live in internal/check/testdata/. Docs: - README: new check row, dedicated Quick Start example, Global Speed Check section. - Manpage and generated markdown regenerated. - skills/cli/SKILL.md teaches when to reach for check vs. saved monitors. Version bumped to v1.2.0 (new top-level command = semver minor).