chore: add copyright headers to grant-scoring examples and repository scripts

[karagozemin]

Add a per-file copyright header so ownership is visible at the file level (consistent with the root LICENSE).

Mechanical change — prepend this exact line as the first line of each file, nothing else:

// Copyright (c) 2026 Sub Rosa contributors

Add it to the following files:

• examples/grant-scoring/src/fixture-client.ts
• examples/grant-scoring/src/fixture-submission.ts
• examples/grant-scoring/src/fixtures.ts
• examples/grant-scoring/src/index.ts
• examples/grant-scoring/src/pilot.ts
• examples/grant-scoring/src/receipt.ts
• examples/grant-scoring/src/reveal-readiness.ts
• examples/grant-scoring/src/run-fixture-pilot.ts
• examples/grant-scoring/src/scoring.ts
• examples/grant-scoring/src/seal-score.ts
• examples/grant-scoring/src/types.ts
• scripts/check-deploy-docs.mjs
• scripts/check-deploy-docs.test.mjs
• scripts/check-fixture-sizes.mjs
• scripts/check-fixture-sizes.test.mjs
• scripts/check-links.js
• scripts/check-snapshots.mjs
• scripts/check-threat-model-anchors.mjs
• scripts/check-threat-model-anchors.test.mjs

[Caneryy]

Can I work on this issue?

[grantfox-oss]

🦊 GrantFox — @Caneryy has been assigned to this issue as part of the Third Campaign campaign!

Next steps:

1. Open a Pull Request referencing this issue (e.g., Closes #215)
2. Your PR will be reviewed by the Sub-Rosa-Issue maintainers

Good luck! Track your progress on GrantFox.