Add challenge rubric readiness gate

[swhan0329]

/claim #18

Summary

• Adds a self-contained challenge rubric readiness gate for SCIBASE issue Scientific Bounty System #18.
• Validates scientific context, problem statement, deliverables, measurable scoring rubric, timeline, prize amount, payout schedule, private/NDA handling, submission privacy, sponsor contact, and IP policy before a bounty is published.
• Reconciles rubric weights to 100 and payout milestones to the advertised prize amount.
• Emits readiness status, blockers, warnings, recommended actions, and a deterministic audit digest.
• Includes runnable tests, a demo script, requirements mapping, acceptance notes, SVG preview, and an H.264 demo video.

Scope notes

• This is intentionally scoped to the Challenge Posting Portal pre-posting readiness gate.
• It avoids broad bounty-system modules, submission package builders, payout eligibility gates, IP redaction gates, amendment controls, appeals ledgers, sponsor scorecards, collusion checks, reviewer consensus, and milestone monitors already represented by other submissions.

Validation

• node challenge-rubric-readiness-gate/test.js
• node challenge-rubric-readiness-gate/demo.js
• node --check challenge-rubric-readiness-gate/index.js
• node --check challenge-rubric-readiness-gate/test.js
• node --check challenge-rubric-readiness-gate/demo.js
• ffprobe -v error -show_entries format=duration,size -show_entries stream=codec_name,width,height -of default=noprint_wrappers=1 challenge-rubric-readiness-gate/demo.mp4
• git diff --check
• git diff --cached --check

Demo video: H.264, 1280x720, 5 seconds.

AI-assisted with Codex, reviewed and locally verified before submission.

[swhan0329]

@algora-pbc /claim #18

[swhan0329]

/claim #18