Disable Dependabot updates

[SilverSupplier]

Summary

• Remove .github/dependabot.yml to stop weekly automated dependency update PRs.
• Keep the repo quieter while the project focuses on the HCI game implementation and release work.

Related Issues

• Closes:
• Related:
• Follow-up:

Verification

• npm run validate:docs; Not run, repository automation config only.
• npm test; Not run, repository automation config only.
• npm run build; Not run, repository automation config only.
• Unity EditMode tests: Not run, no Unity code changed.
• Unity PlayMode tests: Not run, no Unity code changed.
• GitHub checks observed: pending on PR creation.
• Not run; reason: deleting Dependabot configuration only affects future GitHub automation scheduling.

Notes

• Scope: disables Dependabot PR generation for npm and GitHub Actions updates.
• Out of scope / follow-up: manually updating dependencies during release hardening.
• Risk notes: dependency update PRs will no longer appear automatically; updates should be handled intentionally when the game is closer to release.

Review Checklist

• This PR changes user-facing UI or behavior.
• This PR changes recognizer behavior.
• This PR changes docs, task state, or project process.
• This PR changes ML artifacts, datasets, generated outputs, or capture/export behavior.
• This PR changes logging, survey fields, privacy, or research data handling.
• This PR needs screenshots or a short playtest note.

Screenshots / Playtest Notes

Not applicable; repository automation cleanup only.