Fix potential crashes and unhandled exceptions in spark-intelligence-builder helpers (Batch 124)

[Ra229287]

This PR fixes bugs #3935 to #3939.

Packet

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    "title": "Potential unhandled crashes in spark-intelligence-builder helpers (Batch 124)",
    "actual_behavior": "Various helper functions in spark-intelligence-builder crashed with raw tracebacks when variables did not conform to expected formats.",
    "expected_behavior": "All helper functions should gracefully check parameter structures and parameter types, falling back to safe defaults without tracebacks.",
    "repro_steps": [
      "Pass invalid types to _list in src/spark_intelligence/self_awareness/system_map_read_model.py",
      "Pass invalid types to _int in src/spark_intelligence/self_awareness/system_map_read_model.py",
      "Pass invalid types to _float in src/spark_intelligence/self_awareness/system_map_read_model.py",
      "Pass invalid types to _int_mapping in src/spark_intelligence/self_awareness/system_map_read_model.py",
      "Pass invalid types to _safe_summary_mapping in src/spark_intelligence/self_awareness/system_map_read_model.py"
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    "affected_workflow": "spark-intelligence-builder utility lifecycle"
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    "before_after_proof": "Before: raw traceback crashes. After: safe type validation guards prevent all tracebacks.",
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  "proposed_fix": {
    "approach": "Added explicit type checks, try-except containment guards, and fallback initializers across 5 helper functions.",
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