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.

.cursor/skills/continuous-learning-v2/config.json

@@ -1,41 +0,0 @@
-{
-  "version": "2.0",
-  "observation": {
-    "enabled": true,
-    "store_path": "~/.claude/homunculus/observations.jsonl",
-    "max_file_size_mb": 10,
-    "archive_after_days": 7,
-    "capture_tools": ["Edit", "Write", "Bash", "Read", "Grep", "Glob"],
-    "ignore_tools": ["TodoWrite"]
-  },
-  "instincts": {
-    "personal_path": "~/.claude/homunculus/instincts/personal/",
-    "inherited_path": "~/.claude/homunculus/instincts/inherited/",
-    "min_confidence": 0.3,
-    "auto_approve_threshold": 0.7,
-    "confidence_decay_rate": 0.02,
-    "max_instincts": 100
-  },
-  "observer": {
-    "enabled": false,
-    "model": "haiku",
-    "run_interval_minutes": 5,
-    "min_observations_to_analyze": 20,
-    "patterns_to_detect": [
-      "user_corrections",
-      "error_resolutions",
-      "repeated_workflows",
-      "tool_preferences",
-      "file_patterns"
-    ]
-  },
-  "evolution": {
-    "cluster_threshold": 3,
-    "evolved_path": "~/.claude/homunculus/evolved/",
-    "auto_evolve": false
-  },
-  "integration": {
-    "skill_creator_api": "https://skill-creator.app/api",
-    "backward_compatible_v1": true
-  }
-}