feat: improve issue templates and repo hygiene

[0xAxiom]

What

Enhanced GitHub issue templates and updated repository metadata for better community engagement and user experience.

Why

Based on repository review findings:

• Original issue templates were basic and didn't capture enough context
• GitHub repo description was outdated (referenced old "market signals" positioning vs current "Describe it. Build it. Ship it.")
• Missing community links in issue template config

Changes

• Enhanced bug report template: Added pipeline dropdown, better structure, required fields for reproduction steps
• Improved feature request template: Added priority levels, implementation commitment options, better categorization
• Updated issue template config: Added links to Discord, documentation, and live platforms
• Updated GitHub repo description (via API): Now matches current README positioning

Impact

• Better quality bug reports with more actionable information
• Clearer feature request triage with priority indicators
• Improved first-time contributor experience
• More discoverable community resources

Tested

• All templates validated with GitHub's YAML schema
• Templates render correctly in GitHub issue creation UI
• No conflicts with existing 10+ open PRs (focuses on .github/ directory only)