Fix inconsistent list indentation in README.md Contributing section

[Copilot]

List items under "Requirements:" and "Tips for high coherence:" used 4-space indentation while all other lists in the document use no indentation, breaking markdown rendering consistency.

Changes:

• Removed 4-space indentation from 7 list items in Contributing section (lines 191-199)
• All lists now use standard - format without leading spaces

Before:

**Requirements:**
    - Tests pass (`bun test`)
    - No lint errors (`bun run lint`)

After:

**Requirements:**
- Tests pass (`bun test`)
- No lint errors (`bun run lint`)

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[github-actions]

🌀 Agent Review: Coherence >60%. Ethical quantum sims validated. Ready for merge.