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/commands/verify.md

@@ -1,59 +0,0 @@
-# Verification Command
-
-Run comprehensive verification on current codebase state.
-
-## Instructions
-
-Execute verification in this exact order:
-
-1. **Build Check**
-   - Run the build command for this project
-   - If it fails, report errors and STOP
-
-2. **Type Check**
-   - Run TypeScript/type checker
-   - Report all errors with file:line
-
-3. **Lint Check**
-   - Run linter
-   - Report warnings and errors
-
-4. **Test Suite**
-   - Run all tests
-   - Report pass/fail count
-   - Report coverage percentage
-
-5. **Console.log Audit**
-   - Search for console.log in source files
-   - Report locations
-
-6. **Git Status**
-   - Show uncommitted changes
-   - Show files modified since last commit
-
-## Output
-
-Produce a concise verification report:
-
-```
-VERIFICATION: [PASS/FAIL]
-
-Build:    [OK/FAIL]
-Types:    [OK/X errors]
-Lint:     [OK/X issues]
-Tests:    [X/Y passed, Z% coverage]
-Secrets:  [OK/X found]
-Logs:     [OK/X console.logs]
-
-Ready for PR: [YES/NO]
-```
-
-If any critical issues, list them with fix suggestions.
-
-## Arguments
-
-$ARGUMENTS can be:
-- `quick` - Only build + types
-- `full` - All checks (default)
-- `pre-commit` - Checks relevant for commits
-- `pre-pr` - Full checks plus security scan