new(ziglang.org/zls): Zig Language Server (source build)

[tannevaled]

Summary

Adds the Zig Language Server as projects/ziglang.org/zls/package.yml, a sub-package under the existing ziglang.org recipe.

• From-source build via zig build install -Doptimize=ReleaseSafe. The parent ziglang.org bottle vendors prebuilt zig as a chicken-and-egg exception; downstream Zig tooling like zls is compiled here from source against that bottle.
• Build dep: ziglang.org: '~0.15.1' — zls 0.15.1's minimum_zig_version is 0.15.1, and pantry's current ziglang.org bottle is 0.15.2 (satisfies ~0.15.1).
• Dependency fetching: zig's package manager fetches the three declared tarball deps (known-folders, diffz, lsp-kit) during zig build. The lazy tracy dep is not pulled because tracy is not enabled. Caches are kept inside the build tree (--global-cache-dir/--cache-dir) so the build doesn't touch $HOME.
• skip: fix-patchelf — zig produces statically-linked binaries; matches the parent ziglang.org recipe's pattern.
• Version pin: versions.ignore: - /^0\.16/. zls 0.16.0 exists but requires zig 0.16, which upstream has not released yet. The pin should be removed once ziglang.org ships a 0.16 bottle.

This is the standard cross-distro approach — see Arch's zls PKGBUILD which also drives zig build install -Doptimize=ReleaseSafe against a system zig.

Test plan

• CI builds on linux/x86-64
• CI builds on linux/aarch64
• CI builds on darwin/aarch64
• CI builds on darwin/x86-64
• zls --version prints 0.15.1

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