Add explanatory comments and explicit assignment to exception handler

[Copilot]

Addresses code review feedback on PR #26 regarding an empty exception handler that lacked documentation and explicit intent.

Changes

• Added comments explaining why ValueError and TypeError are silently handled when parsing LLM-generated source_lines
• Added explicit source_range = None assignment in exception handler to clarify intent
• Documented specific causes: ValueError for non-integer values, TypeError for None/incompatible types

Context

The exception handler catches malformed output from the LLM when extracting source line ranges. The explicit assignment and comments make the best-effort parsing behavior clear:

except (ValueError, TypeError):
    # Invalid source_lines format - skip source range extraction
    # ValueError: LLM returned non-integer values
    # TypeError: source_lines is None or incompatible type
    source_range = None

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