Improve hero evasive AI for projectiles

[npiron]

Summary

• Behavior: Player movement now dodges incoming projectiles more intelligently, strafing instead of drifting into shots.
• Tech: Danger vector blends enemy proximity with predicted projectile paths and includes new Vitest coverage for projectile-aware movement.

Testing

• npm test
• npm run typecheck

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Codex Task

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[Copilot]

Pull request overview

This PR enhances the player's AI to dodge enemy projectiles more intelligently by incorporating projectile trajectory prediction into the danger awareness system. The AI now strafes perpendicular to incoming projectiles rather than drifting into them, significantly improving survival against ranged attacks.

Key Changes

• Extended calculateDangerVector() to analyze enemy projectile trajectories using time-to-closest-approach calculations
• Blends lateral (perpendicular) and incoming directions for imminent threats, providing natural strafing behavior
• Added comprehensive Vitest test coverage validating projectile avoidance, proper filtering of retreating projectiles, and threat prioritization

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
tests/playerAI.test.ts	New test suite with 3 test cases covering projectile dodging, filtering of non-threatening projectiles, and combined enemy+projectile scenarios
src/player.ts	Updated calculateDangerVector() to incorporate projectile threat analysis with trajectory prediction, lateral dodging, and updated documentation

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