v0.4.1

Patch release: v0.4.0 shipped no binaries because the release workflow failed to cross-compile. Language and runtime content is identical to v0.4.0 — see those notes for what's new in 0.4.

Fixed — Cross-Platform Release Builds

• macOS — timeval.usec is c_int on Darwin but i64 on Linux; the cap:net deadline code now casts to the platform's field types.
• Windows — cap:fs read/exists used std.posix.openat (absent on Windows) since the post-v0.3.1 perf rewrite (#73); on Windows they fall back to the std.Io implementation that v0.3.1 shipped.

No behavior changes on Linux.

Full changelog: CHANGELOG.md · v0.3.1...v0.4.1