docs: add rendered SPulse GrantFox pitch video

Author: mubby4

pitch-video/SPulse-GrantFox-Pitch.mp4

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+Prediction markets can be expensive, difficult to understand, and dependent on centralized platforms that control user funds and settlement.
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+SPulse is a non-custodial prediction-market platform built on Stellar, designed to make transparent markets fast, accessible, and easy to explore.
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+Users can discover clear questions, review probabilities and resolution criteria, preview positions in XLM, and follow community performance through a dedicated leaderboard.
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+The current static application connects to Freighter on Stellar Testnet and displays live public network information. Full browser-to-contract transaction submission is our next integration milestone.
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+Behind the product are four interconnected Soroban contracts managing prediction markets, referrals, leaderboard points, and PULSE rewards through transparent on-chain rules.
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+All four contracts are deployed on Testnet. We have completed eighty-nine contract tests and verified registration, positions, cancellation refunds, resolution, claims, points, and reward distribution.
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+With GrantFox support, we will complete direct contract integration, test SPulse with external users, strengthen protocol security, and prepare for a responsible mainnet launch.
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+SPulse is building a faster, clearer, and community-driven prediction-market experience powered by Stellar.
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