chore: copyright header on every source file + GitHub Sponsors button

[KageBinary]

Tanner, in Slack: every source file in the open source needs a copyright line at the top, in the format already used with LLC replaced by Inc.. Plus a Sponsor button, since the org has GitHub Sponsorship.

Copyright headers

26 source files get the header as their first line, in each language's own comment syntax:

// Copyright 2026 Ix Infrastructure Inc.

Shebangs stay on line 1 — the header goes after #!/usr/bin/env bash and friends, verified mechanically across every changed file.

The wording matches the LICENSE/NOTICE in the main Ix repo, which read Copyright 2026 Ix Infrastructure LLC, with LLC → Inc..

Excluded

2,834 files under node_modules/, which is committed to this repo. They are third-party dependencies — we have no standing to put our copyright on them — and any header would be lost on the next npm install anyway.

Sponsor button

The org already has a public sponsors listing at github.com/sponsors/ix-infrastructure, but no repo had a .github/FUNDING.yml — that file, not a README edit, is what renders GitHub's Sponsor button. This adds it, plus a sponsor badge at the top of the README.

Verification

bun test 125 passed / 3 skipped / 0 failed.

Part of a 10-repo sweep across the Ix open source; the main repo is Ix#663.

🤖 Generated with Claude Code

https://claude.ai/code/session_016WMzUgkHNBXpThNT9c9wWw

LICENSE copyright holder

The Apache-2.0 appendix here still carried the literal template placeholder — Copyright [yyyy] [name of copyright owner] — so the repo's own license named no owner at all. It now reads Copyright 2026 Ix Infrastructure Inc., matching the header these PRs add to the source files and the notice in the main Ix repo.

CI gate

Headers decay the moment someone adds a file, so this PR also ships the gate. .github/workflows/copyright.yml runs on every PR and push to main and fails the build listing each offender:

2 source file(s) are missing the copyright header:

  ix-cli/src/cli/brand-new.ts
  scripts/brand-new.sh

Fix them all with:

    python3 .github/scripts/copyright-headers.py --fix

The same script carries --fix, so a contributor repairs every offender in one command rather than hand-editing files.

It reuses the exact exclusion rules the headers were applied under — fixtures, linguist-generated paths, build output, dependencies — so the gate agrees with the tree instead of fighting it. Verified by adding a throwaway .ts, a throwaway .sh and a throwaway fixture: it flagged the first two, correctly ignored the fixture, --fix repaired both with the shebang left on line 1, and the re-check went green.

No setup-python step — python3 is preinstalled on ubuntu-latest and the script is stdlib plus git ls-files / git check-attr.

To make this binding, the check needs adding to branch protection — otherwise it reports but cannot block.