LegacyFix: add modernization report

LEGACYFIX.md

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+# ⚡ LegacyFix Report
+
+**Repository:** `mitsuhiko/flask`
+**Generated:** 2026-05-02 14:56 UTC
+**Total lines modernized:** 4
+**Files changed:** 3
+
+## Changes
+
+| File | Lines Changed | Modernization | Security Notes |
+|------|--------------|---------------|----------------|
+| `src/flask/cli.py` | 1 | 🔒 Security Fix | eval() is dangerous — arbitrary code execution risk |
+| `src/flask/config.py` | 1 | 🔒 Security Fix | DEBUG=True should never be in production |
+| `src/flask/sessions.py` | 2 | 🔒 Security Fix | SHA1 is cryptographically weak; SHA1 is cryptographically weak |
+
+## What LegacyFix does
+
+| Fix Type | Description |
+|----------|-------------|
+| 🐍 Python 2→3 | Converts print statements, exception syntax, dict methods, string formatting |
+| ⚡ JS Modernize | Replaces `var` with `const`/`let`, converts callbacks to arrow functions |
+| 🔒 Security | Flags MD5, SHA1, eval(), Math.random(), SQL injection patterns |
+
+## Review Checklist
+
+- [ ] Review each file diff before merging
+- [ ] Run your test suite
+- [ ] Check security flagged lines manually
+- [ ] Merge when confident ✅
+
+---
+*Generated by LegacyFix — Replit's 10th Birthday Hackathon 🎂*