Readability improvements across streaming_parser, input_formatter, commands
- streaming_parser.rs: Reduced ~70 lines by removing redundant comments,
consolidating doc comments, using slice syntax for TOOL_CALL_PATTERNS
- input_formatter.rs: Lazy regex compilation via once_cell (performance),
cleaner function structure, reduced comment noise
- commands.rs: Extracted format_research_task_summary() and
format_research_report_header() helpers, reduced ~40 lines of duplication
- pending_research.rs: Fixed 2 unused variable warnings in tests
All changes are behavior-preserving. 446 tests pass.
Agent: carmack
afc5bc8574