Fix potential crashes and unhandled exceptions in character helper functions (Batch char-3)

[Ra229287]

This PR fixes bugs #1210 to #1214.

Packet

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    "severity": "medium",
    "title": "Potential unhandled crashes in character helper functions (Batch char-3)",
    "actual_behavior": "Various character functions 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 load_chip in src/spark_character/chip_loader.py",
      "Pass invalid types to load_chip_by_id in src/spark_character/chip_loader.py",
      "Pass invalid types to render_chip_to_system_prompt in src/spark_character/chip_loader.py",
      "Pass invalid types to _trait_directives in src/spark_character/chip_loader.py",
      "Pass invalid types to _emotional_trigger_list in src/spark_character/chip_loader.py"
    ],
    "affected_workflow": "Character pipeline life-cycle"
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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 character helper functions.",
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