Build Zwanzig as a host lint dependency

[forketyfork]

Summary

Architect pinned Zwanzig v0.13.1 and built the linter for the application's target. That works for native builds, but a cross-compiled build can produce a Zwanzig executable that the host cannot run.

This updates the integration to the documented pattern:

• bump Zwanzig to v0.14.0 with its fetched Zig package hash
• build the linter for b.graph.host in ReleaseFast
• forward the application's target architecture and operating system to Zwanzig through --target
• expose the dependency through the direct zig build lint setup
• document Zwanzig as a build-time dependency

Validation

• zig build
• zig build test
• nix develop --command just lint
• nix develop --command zig build lint -Dtarget=x86_64-linux-gnu

[chatgpt-codex-connector]

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