Fix potential crashes and unhandled exceptions in spark-intelligence-builder helpers (Batch 113)

[Ra229287]

This PR fixes bugs #3880 to #3884.

Packet

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    "title": "Potential unhandled crashes in spark-intelligence-builder helpers (Batch 113)",
    "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 _resolve_swarm_runtime_root_env in src/spark_intelligence/swarm_bridge/local.py",
      "Pass invalid types to _specialization_repo_env_var in src/spark_intelligence/swarm_bridge/local.py",
      "Pass invalid types to _resolve_specialization_path_repo_root in src/spark_intelligence/swarm_bridge/local.py",
      "Pass invalid types to _resolve_session_summary_path in src/spark_intelligence/swarm_bridge/local.py",
      "Pass invalid types to _list_session_ids in src/spark_intelligence/swarm_bridge/local.py"
    ],
    "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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