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/commands/verify.md

@@ -1,67 +0,0 @@
----
-description: Run verification loop to validate implementation
-agent: build
----
-
-# Verify Command
-
-Run verification loop to validate the implementation: $ARGUMENTS
-
-## Your Task
-
-Execute comprehensive verification:
-
-1. **Type Check**: `npx tsc --noEmit`
-2. **Lint**: `npm run lint`
-3. **Unit Tests**: `npm test`
-4. **Integration Tests**: `npm run test:integration` (if available)
-5. **Build**: `npm run build`
-6. **Coverage Check**: Verify 80%+ coverage
-
-## Verification Checklist
-
-### Code Quality
-- [ ] No TypeScript errors
-- [ ] No lint warnings
-- [ ] No console.log statements
-- [ ] Functions < 50 lines
-- [ ] Files < 800 lines
-
-### Tests
-- [ ] All tests passing
-- [ ] Coverage >= 80%
-- [ ] Edge cases covered
-- [ ] Error conditions tested
-
-### Security
-- [ ] No hardcoded secrets
-- [ ] Input validation present
-- [ ] No SQL injection risks
-- [ ] No XSS vulnerabilities
-
-### Build
-- [ ] Build succeeds
-- [ ] No warnings
-- [ ] Bundle size acceptable
-
-## Verification Report
-
-### Summary
-- Status: ✅ PASS / ❌ FAIL
-- Score: X/Y checks passed
-
-### Details
-| Check | Status | Notes |
-|-------|--------|-------|
-| TypeScript | ✅/❌ | [details] |
-| Lint | ✅/❌ | [details] |
-| Tests | ✅/❌ | [details] |
-| Coverage | ✅/❌ | XX% (target: 80%) |
-| Build | ✅/❌ | [details] |
-
-### Action Items
-[If FAIL, list what needs to be fixed]
-
----
-
-**NOTE**: Verification loop should be run before every commit and PR.