Confirm metadata with-block requirement already enforced

Verified fastparse parser correctly requires with { } wrapper for metadata:
- Rejects bare metadata after closing brace
- Rejects metadata inside definition body
- Accepts only proper with { briefly "..." } syntax

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: respencer-ncl

NOTEBOOK.md

@@ -158,6 +158,13 @@ The `pseudoCodeBlock` parser now allows comments before and/or after `???`:
 
 **Test Results**: All 715 tests pass across all modules
 
+**Task #10 Verification** (metadata with-block requirement):
+- Confirmed fastparse already correctly enforces `with { }` wrapper for metadata
+- `} briefly "..."` (after close, no with) → Rejected ✅
+- `{ briefly "..." }` (inside body) → Rejected ✅
+- `} with { briefly "..." }` (correct syntax) → Accepted ✅
+- No code changes needed - task was already satisfied
+
 **Files Modified**:
 - `language/shared/src/main/resources/riddl/grammar/ebnf-grammar.ebnf`
 - `language/shared/src/main/scala/com/ossuminc/riddl/language/parsing/TypeParser.scala`