add pr description template

[0xgleb]

Motivation

PR descriptions were freeform — some empty, some run-instructions, some bot-generated noise — and math-bearing docs had no shared bar for rigor. Reviewers need the same two questions answered on every PR, and formula docs need symbols defined before use.

Solution

• Add .github/PULL_REQUEST_TEMPLATE.md with Motivation / Solution sections and inline guidance; GitHub pre-fills it on every new PR
• Add Documentation Standards to AGENTS.md: notation tables before first symbol use, GitHub-LaTeX conventions (no code identifiers in math mode — markdown strips \_ before MathJax parses), clickable source citations
• All currently open PRs (feat: frontend plot #6, feat: orderbook smart contract #7, docs: margin mechanism #13) already follow the PR format

[coderabbitai]

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro Plus

Run ID: 60af279e-7ac9-4efd-b25c-2ee1907b7631

📥 Commits

Reviewing files that changed from the base of the PR and between a96c3ff and 64d020e.

📒 Files selected for processing (2)

• .github/PULL_REQUEST_TEMPLATE.md
• AGENTS.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/pr-template

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