Fix potential crashes and unhandled exceptions in cli utility helpers (Batch 20)

[Ra229287]

This PR fixes bugs #321 to #325.

Packet

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    "type": "bug",
    "severity": "medium",
    "title": "Potential unhandled crashes in cli utility helpers (Batch 20)",
    "actual_behavior": "Various CLI parameters, environment definitions, and helper outputs 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 summarize_command_output",
      "Pass invalid types to telegram_ingress_is_external",
      "Pass invalid types to initial_follow_log_lines",
      "Pass invalid types to first_message_wait_seconds",
      "Pass invalid types to read_clipboard_text"
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    "affected_workflow": "CLI Utility 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 cli helper functions.",
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