Add pc-gaming skill for hardware specs and graphics settings advice

skills/pc-gaming/SKILL.md

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+---
+name: pc-gaming
+description: Recommend optimal graphics settings for PC games based on user's hardware specs. Use when the user asks about game settings, FPS expectations, ray tracing feasibility, resolution choices, or whether their PC can run a specific game well. Also covers driver info (Mesa/RADV) and Linux gaming specifics.
+---
+
+# PC Gaming Settings Advisor
+
+## Hardware Profile
+
+Read `references/hardware.md` for the user's current PC specs before making recommendations.
+
+## How to Recommend Settings
+
+1. Read `references/hardware.md` for specs
+2. Search web for recent benchmarks of the specific game + GPU combo
+3. Consider: resolution, RT capability, upscaling (FSR/DLSS), VRAM limits, CPU bottlenecks
+4. Give concrete settings (not vague "medium/high") when possible
+5. Note Linux-specific issues if applicable (shader compilation, Mesa version, Proton/Wine)
+
+## Key Principles
+
+- 7900 XTX = excellent rasterization, weaker RT than NVIDIA equivalents
+- FSR Quality from 1440p → 4K is the sweet spot for RT games
+- Native 4K without RT often looks better than lower res + RT (except path-traced games like Cyberpunk RT Overdrive)
+- Always check VRAM usage at 4K (24GB is generous but some games push it)
+- Mesa/RADV updates matter significantly for Linux — check version
+
+## Known Game Settings
+
+Read `references/game-settings.md` for previously researched optimal settings per game. Update this file when new games are researched.