fix: correct step reference in specify.md to prevent validation loop

Step 6c in the specify template incorrectly referenced "proceed to step
6" (itself), creating an infinite validation loop. Changed to "proceed
to step 7" (the completion report step).

Closes #1509

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Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: fsilvaortiz

templates/commands/specify.md

@@ -148,7 +148,7 @@ Given that feature description, do this:
 
    c. **Handle Validation Results**:
 
-      - **If all items pass**: Mark checklist complete and proceed to step 6
+      - **If all items pass**: Mark checklist complete and proceed to step 7
 
       - **If items fail (excluding [NEEDS CLARIFICATION])**:
         1. List the failing items and specific issues