Summary

• Adds a deterministic JSON fixture for the CodeBounty issue test issue creation from external sponsor #95 external-sponsor bounty metadata.
• Adds a stdlib-only validator that checks the issue number, visible $50 amount, bounty label, required PR linkage, CodeBounty application requirement, and verified-payable boundary.
• Records the exact collision search terms used before submission so future bounty intake can audit this PR without relying on live platform credentials.

Fixes #95

Validation

• python3 -m py_compile scripts/validate-codebounty-issue-95.py
• python3 scripts/validate-codebounty-issue-95.py test-fixtures/codebounty-issue-95-external-sponsor.json
• Python fixture assertions for issue number, $50 amount, fixes #95 linkage, CodeBounty application requirement, verified-payable=false, and zero exact issue PR matches at authoring.
• git diff --check

Live collision/state proof before push

• Repo: public and not archived.
• Issue test issue creation from external sponsor #95: open, unassigned, 💰 Bounty Available, 1 CodeBounty bot comment, no Bounty In Progress, Bounty Awarded, or duplicate label.
• Open PR exact-term checks immediately before push: 95 = 0, fixes #95 = 0, issue 95 = 0.
• Advisory same-scope phrase external sponsor matched prior fixture PRs for other issues (Creating issue as an external user without App Installed #83/test issue creation from external sponsor #2 apr 15 #96), not issue test issue creation from external sponsor #95.

Payout boundary

This PR is submitted-visible for the public $50 CodeBounty issue. Verified-payable remains $0 until CodeBounty platform application eligibility and maintainer/platform acceptance are confirmed.