docs: update implementation summaries for S003 and S012 with modified behavior and rule documentation

Author: leojay-net

S003_IMPLEMENTATION_SUMMARY.md

@@ -353,13 +353,6 @@ FindingCode {
 3. Update `docs/rules/s003-arithmetic-overflow.md`
 4. Add fixture example to `s003_arithmetic.rs`
 
-### Modifying Behavior
-
-1. Update unit tests to reflect new behavior
-2. Regenerate SARIF snapshots: `cargo insta review`
-3. Update integration tests in `lib.rs`
-4. Document change in `docs/rules/s003-arithmetic-overflow.md` Changelog
-5. Consider schema versioning if JSON format changes
 
 ### Testing Checklist
 
@@ -369,6 +362,15 @@ FindingCode {
 - [ ] SARIF snapshot matches: `cargo insta test`
 - [ ] Documentation updated: Review `docs/rules/s003-arithmetic-overflow.md`
 
+### Modifying Behavior
+
+1. Update unit tests to reflect new behavior
+2. Regenerate SARIF snapshots: `cargo insta review`
+3. Update integration tests in `lib.rs`
+4. Document change in `docs/rules/s003-arithmetic-overflow.md` Changelog
+5. Consider schema versioning if JSON format changes
+
+
 ## Related Work
 
 ### Cross-References

S012_IMPLEMENTATION_COMPLETE.md

@@ -33,17 +33,19 @@ Successfully hardened the S012 (SEP-41 token interface compliance) checker in `t
 - Usage examples and safety considerations
 - Clear contribution guidelines
 
-**Rule Documentation:**
-- Complete rule guide at `docs/rules/s012-sep41-interface.md` (431 lines)
-- Examples for all three issue types
-- Remediation guidance and reference implementations
-- Cross-references to related checks
+
 
 **Reference Implementation:**
 - Production-ready example at `examples/sep41-compliant-token.rs` (317 lines)
 - Demonstrates all 10 SEP-41 functions correctly
 - Extensive inline comments explaining compliance
 
+**Rule Documentation:**
+- Complete rule guide at `docs/rules/s012-sep41-interface.md` (431 lines)
+- Examples for all three issue types
+- Remediation guidance and reference implementations
+- Cross-references to related checks
+
 ### ✅ Tests Added (Unit + Integration)
 
 **Unit Tests** (existing):