Add CLAUDE.md project context for Claude Code

CLAUDE.md

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+# CLAUDE.md — iso-bot project context
+
+## What is this?
+A screen-reading bot engine for isometric games. First target: Diablo II: Resurrected (D2R).
+No memory injection, no hooking — purely screen capture + computer vision + input simulation.
+
+## Tech Stack
+- **Go 1.23+** — core engine
+- **Pure Go image processing** (no GoCV yet) — vision pipeline
+- **net/http + WebSocket** — API server
+- **SolidJS + TypeScript** — web dashboard (planned, currently vanilla HTML)
+
+## Project Structure
+```
+cmd/iso-bot/       Entry point. --dev flag for development mode
+cmd/debug/         Debug tool for analyzing screenshots
+pkg/engine/        Core engine (capture, vision, input, state, safety, loot, resolution)
+pkg/plugin/        Game plugin interfaces
+pkg/api/           REST + WebSocket API
+plugins/d2r/       Diablo II: Resurrected plugin
+web/dev/           Dev dashboard (single HTML file)
+config/            YAML configs
+testdata/          Test screenshots
+```
+
+## Build & Run
+```bash
+go build ./cmd/iso-bot
+./iso-bot --dev --api :8080                    # Uses testdata/d2r_1080p.png
+./iso-bot --dev --api :8080 --capture-file path/to/screenshot.png
+go run ./cmd/debug                              # Analyze screenshot regions
+```
+
+## Key Architecture Decisions
+- **Plugin system**: `pkg/plugin/plugin.go` defines interfaces. Games implement them.
+- **Resolution profiles**: Each game registers pixel-exact regions per resolution in `pkg/engine/resolution/`
+- **Modular capture**: `pkg/engine/capture/backends/` — file, window, VNC, Spice, Wayland, etc.
+- **Declarative loot filter**: YAML rules in `plugins/d2r/loot/default.yaml`
+
+## Git
+```bash
+git add -A && git commit -m "message"
+GIT_SSH_COMMAND="ssh -o StrictHostKeyChecking=no" git push origin main
+```
+
+## Important Notes
+- Always run `go build ./cmd/iso-bot` after changes to verify compilation
+- The testdata/d2r_1080p.png is a REAL D2R screenshot — use it for testing
+- HSV ranges in plugins/d2r/config.go are calibrated for real screenshots
+- D2R uses circular orbs for health/mana, not horizontal bars
+- Region coordinates are for 1920x1080 resolution