chore: bump zig pin 0.17.0-dev.1275 → 0.17.0-dev.1441 (align with zig-js)

Why

zig-js moved to 0.17.0-dev.1441+d5181a9c9, and Home will eventually consume zig-js — so align Home's toolchain pin to match, keeping the two in sync.

Verified locally (macos-arm64)

The 166-commit jump 1275→1441 has no breaking changes for Home:

• zig build debug compiles with zero errors
• resulting binary runs clean across every path:
  • Home-language: home run examples/hello.home → Hello, Home!
  • JSC runtime: home test test/js/node/path/basename.test.js → 4/0
  • CLI run-flag path: parse_args/default-args.test.mjs → 8/0

What changed (exact version-string swap, 19 refs / 13 files)

• pantry.json / pantry.lock (pkgx-style lock — no embedded hashes to regen)
• package.json, packages/comptime/home.toml
• 5 CI workflows (mlugg/setup-zig version): release, conformance-gate, fuzz-nightly, ci, dataplane-bench
• version-guard scripts: run_tests.sh, check-test-count.sh, tools/ts_parity_snapshot.py
• doctor/help text in src/main.zig

What this PR's CI adds

Local proof was macos-arm64 only — CI here validates the full platform matrix under 1441. Safe to merge once green.