feat(ecc): prune plugin 43→12 items, promote 7 rules to .claude/rules/ (#245)

ECC community plugin pruning: removed 530+ non-essential files
(.cursor/, .opencode/, docs/ja-JP, docs/zh-CN, docs/zh-TW,
language-specific skills/agents/rules). Retained 4 agents,
3 commands, 5 skills. Promoted 13 rule files (8 common + 5
typescript) to .claude/rules/ for CC native loading. Extracted
reusable patterns to EXTRACTED-PATTERNS.md.

.opencode/package.json

@@ -1,70 +0,0 @@
-{
-  "name": "ecc-universal",
-  "version": "1.4.1",
-  "description": "Everything Claude Code (ECC) plugin for OpenCode - agents, commands, hooks, and skills",
-  "main": "dist/index.js",
-  "types": "dist/index.d.ts",
-  "type": "module",
-  "exports": {
-    ".": {
-      "types": "./dist/index.d.ts",
-      "import": "./dist/index.js"
-    },
-    "./plugins": {
-      "types": "./dist/plugins/index.d.ts",
-      "import": "./dist/plugins/index.js"
-    },
-    "./tools": {
-      "types": "./dist/tools/index.d.ts",
-      "import": "./dist/tools/index.js"
-    }
-  },
-  "files": [
-    "dist",
-    "commands",
-    "prompts",
-    "instructions",
-    "opencode.json",
-    "README.md"
-  ],
-  "scripts": {
-    "build": "tsc",
-    "clean": "rm -rf dist",
-    "prepublishOnly": "npm run build"
-  },
-  "keywords": [
-    "opencode",
-    "plugin",
-    "claude-code",
-    "agents",
-    "ecc",
-    "ai-coding",
-    "developer-tools",
-    "hooks",
-    "automation"
-  ],
-  "author": "affaan-m",
-  "license": "MIT",
-  "repository": {
-    "type": "git",
-    "url": "git+https://github.com/affaan-m/everything-claude-code.git"
-  },
-  "bugs": {
-    "url": "https://github.com/affaan-m/everything-claude-code/issues"
-  },
-  "homepage": "https://github.com/affaan-m/everything-claude-code#readme",
-  "publishConfig": {
-    "access": "public"
-  },
-  "peerDependencies": {
-    "@opencode-ai/plugin": ">=1.0.0"
-  },
-  "devDependencies": {
-    "@opencode-ai/plugin": "^1.0.0",
-    "@types/node": "^20.0.0",
-    "typescript": "^5.3.0"
-  },
-  "engines": {
-    "node": ">=18.0.0"
-  }
-}