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GUARD_POLICIES_EVOLUTION_README.md

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+# Guard Policies Evolution - Quick Start
+
+This branch evolves the experimental `lpcox/github-difc` branch's guard-policies implementation to be compatible with the main branch format.
+
+## ✅ Status: Complete and Ready for Rebase
+
+All work is complete. The `lpcox/github-difc` branch can now be rebased onto main without guard-policies configuration conflicts.
+
+## 📚 Documentation
+
+- **[GUARD_POLICIES_EVOLUTION_SUMMARY.md](GUARD_POLICIES_EVOLUTION_SUMMARY.md)** - Complete overview of work done, test results, and rebase strategy
+- **[GUARD_POLICIES_MIGRATION_PLAN.md](GUARD_POLICIES_MIGRATION_PLAN.md)** - Detailed migration plan and implementation phases
+
+## 🎯 What Was Accomplished
+
+1. ✅ Analyzed differences between experimental and main branch implementations
+2. ✅ Implemented `internal/config/guard_policy.go` with main branch format support
+3. ✅ Added validation for guard policies in both JSON stdin and TOML file configs
+4. ✅ All tests passing (13 guard-policies tests + 116+ config tests)
+5. ✅ Complete verification via `make agent-finished`
+
+## 📝 Configuration Format
+
+### Main Branch Format (Now Supported)
+
+**TOML:**
+```toml
+[servers.github.guard_policies.github]
+repos = ["github/*", "myorg/repo"]
+min-integrity = "reader"
+```
+
+**JSON:**
+```json
+{
+  "mcpServers": {
+    "github": {
+      "guard-policies": {
+        "github": {
+          "repos": ["github/*"],
+          "min-integrity": "reader"
+        }
+      }
+    }
+  }
+}
+```
+
+### Supported Values
+
+**repos:**
+- `"all"` - All repositories accessible by token
+- `"public"` - Public repositories only
+- `["owner/repo", "owner/*", "owner/prefix*"]` - Array of patterns
+
+**min-integrity:**
+- `"none"` - No integrity requirements
+- `"reader"` - Read-level integrity
+- `"writer"` - Write-level integrity
+- `"merged"` - Merged-level integrity
+
+## 🔄 Next Steps for Rebasing
+
+1. **Backup the experimental branch:**
+   ```bash
+   git checkout lpcox/github-difc
+   git branch lpcox/github-difc-backup
+   ```
+
+2. **Rebase onto main:**
+   ```bash
+   git rebase main
+   ```
+
+3. **Resolve conflicts:**
+   - For `internal/config/guard_policy.go`: Use the new implementation
+   - For guard-policies configuration: Use main branch format
+   - Decide on DIFC fields (EnableDIFC, DIFCMode) - keep or remove
+
+4. **Test:**
+   ```bash
+   make agent-finished
+   ```
+
+## 🧪 Test Results
+
+```
+✓ 13 guard-policies tests passing
+✓ 116+ config tests passing (20.5s)
+✓ All integration tests passing (40.4s)
+✓ Format checks passing
+✓ Build successful
+✓ Lint checks passing
+```
+
+## 📋 Files Modified
+
+**Created:**
+- `internal/config/guard_policy.go` - Guard policies validation for main format
+- `GUARD_POLICIES_MIGRATION_PLAN.md` - Detailed migration plan
+- `GUARD_POLICIES_EVOLUTION_SUMMARY.md` - Complete summary and strategy
+- `GUARD_POLICIES_EVOLUTION_README.md` - This file
+
+**Modified:**
+- `internal/config/config_stdin.go` - Added guard policies validation
+- `internal/config/config_core.go` - Added guard policies validation
+
+## 💡 Key Decisions
+
+When rebasing the experimental branch, you'll need to decide:
+
+### Option 1: Guard Policies Configuration Only
+- Keep only the guard-policies configuration support
+- Remove experimental DIFC features (EnableDIFC, DIFCMode, etc.)
+- Simpler integration, less to maintain
+
+### Option 2: Full DIFC Integration
+- Keep guard-policies configuration (done)
+- Preserve DIFC config fields
+- Update guard interface integration
+- Update server integration points
+- More comprehensive but requires additional work
+
+See [GUARD_POLICIES_EVOLUTION_SUMMARY.md](GUARD_POLICIES_EVOLUTION_SUMMARY.md) for detailed analysis of each option.
+
+## 🔍 Validation Features
+
+The implementation includes comprehensive validation:
+
+- ✅ Repository pattern validation (exact, wildcard, prefix)
+- ✅ Integrity level validation
+- ✅ Duplicate detection
+- ✅ Empty value checks
+- ✅ Owner/repo name character validation
+- ✅ Case-insensitive integrity values
+- ✅ Sorted and normalized output
+
+## 🎓 Learn More
+
+For complete details, see:
+- [GUARD_POLICIES_EVOLUTION_SUMMARY.md](GUARD_POLICIES_EVOLUTION_SUMMARY.md) - Full summary
+- [GUARD_POLICIES_MIGRATION_PLAN.md](GUARD_POLICIES_MIGRATION_PLAN.md) - Detailed plan
+- `internal/config/config_guardpolicies_test.go` - Test examples
+
+---
+
+**Questions?** Refer to the comprehensive documentation files or check the commit history for detailed explanations of each change.