fix(mindmaps): Remove blockquote from family_derivation for markmap compatibility

Replace blockquote syntax with plain text for Base Template notes in
family_derivation markmap to ensure proper rendering in markmap viewers.
This aligns with the format used in other mindmap generators.

Author: lufftw

docs/mindmaps/README.md

@@ -12,42 +12,10 @@ Use [markmap](https://markmap.js.org/) VSCode extension or web viewer.
 
 ## Available Mind Maps
 
-### [📐 Pattern Hierarchy](pattern_hierarchy.md)
-
-API Kernels → Patterns → Problems hierarchy
-
 ### [👨‍👩‍👧‍👦 Family Derivation](family_derivation.md)
 
 Base templates and derived problem variants
 
-### [⚡ Algorithm Usage](algorithm_usage.md)
-
-Which algorithms are used in which problems
-
-### [🏗️ Data Structure Usage](data_structure.md)
-
-Data structures used across problems
-
-### [🏢 Company Coverage](company_coverage.md)
-
-Problems frequently asked by companies
-
-### [🗺️ Learning Roadmaps](roadmap_paths.md)
-
-Learning roadmap structures
-
-### [🔗 Problem Relations](problem_relations.md)
-
-Related problems network
-
-### [🔀 Solution Variants](solution_variants.md)
-
-Problems with multiple solution approaches
-
-### [📊 Difficulty × Topics](difficulty_topics.md)
-
-Topics organized by difficulty level
-
 ---
 
 ## How to View

tools/mindmaps/generators/family.py

@@ -37,7 +37,7 @@ def generate_family_derivation(ontology: OntologyData, problems: dict[str, Probl
         if base.solutions:
             notes = base.solutions[0].get("notes", "")
             if notes:
-                lines.extend([f"> {notes}", ""])
+                lines.extend([notes, ""])
 
         lines.extend(["### Derived Problems", ""])
         for derived_id in base.derived_problems: