Update wisp to v0.4.0

[kwsantiago]

Bumps the packaged wisp to v0.4.0 and the build toolchain to Zig 0.16.0.

• Dockerfile: ZIG_VERSION 0.15.2 → 0.16.0 (with updated per-arch SHA256s from ziglang.org); WISP_VERSION v0.2.2 → v0.4.0; WISP_COMMIT → cc7305345bd8a109487d9744fcc2df1eba03a6fc (the commit v0.4.0 points to; the build guard verifies it).
• startos/versions/current.ts: package version 0.2.2:0 → 0.4.0:0 with release notes.

wisp v0.4.0 replaces the thread-per-connection model with an epoll worker pool, keeping memory flat under connection churn (upstream #64).

Validation

Built the Dockerfile builder stage locally (amd64): Zig 0.16.0 downloaded + SHA verified, wisp v0.4.0 cloned + commit guard passed, zig build -Doptimize=ReleaseFast -Dcpu=baseline succeeded, and the resulting wisp binary runs.

[coderabbitai]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 3641cae1-a2ca-4138-8fa4-61aaab05ede0

📥 Commits

Reviewing files that changed from the base of the PR and between 6018773 and 05bc53a.

📒 Files selected for processing (2)

• Dockerfile
• startos/versions/current.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch update/wisp-v0.4.0

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