Rules Hardening — Improve 11 rule files with examples and anti-patterns

[striderZA]

Summary

Each of the 11 rule files in .opencode/rules/ should include concrete examples, anti-pattern checklists, and enforceability criteria. Godot rules as priority.

Current Rules

ai-code.md, data-files.md, design-docs.md, engine-code.md, gameplay-code.md, narrative.md, network-code.md, prototype-code.md, shader-code.md, test-standards.md, ui-code.md

Per-Rule Requirements

• Examples: At least 1 good + 1 bad example per rule
• Anti-pattern checklist: Bulleted list of things to explicitly avoid
• Enforceability: Code-review criteria that can be mechanically checked
• Cross-references: Link to related agents and skills

Godot Priority

• engine-code.md — ensure Godot-specific patterns (signals, autoloads, resources)
• shader-code.md — Godot shading language examples
• gameplay-code.md — Godot node/scene patterns

Acceptance Criteria

• All 11 rule files have examples section
• All 11 rule files have anti-pattern checklist
• Godot-specific content in engine-code, shader-code, gameplay-code
• Cross-references added to related agents/skills