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

This reverts commit 1bd68ff534.

.cursor/rules/context-review.md

@@ -0,0 +1,27 @@
+---
+description: "Code review context: PR review mode with severity-prioritized analysis"
+alwaysApply: false
+---
+
+# Code Review Context
+
+Mode: PR review, code analysis
+Focus: Quality, security, maintainability
+
+## Behavior
+- Read thoroughly before commenting
+- Prioritize issues by severity (critical > high > medium > low)
+- Suggest fixes, don't just point out problems
+- Check for security vulnerabilities
+
+## Review Checklist
+- [ ] Logic errors
+- [ ] Edge cases
+- [ ] Error handling
+- [ ] Security (injection, auth, secrets)
+- [ ] Performance
+- [ ] Readability
+- [ ] Test coverage
+
+## Output Format
+Group findings by file, severity first