27430f1768
- Added timestamp and model fields to message and tool-call structs with serde defaults. - Added timestamp parsing and bucket-format helpers, including clamped percentile calculation. - Added rolling-window call grouping and CSV export via new `--by`, `--top`, `--tool`, and `--calls-csv` options. - Added `TOOL_CALLS_CSV` env fallback and help text updates describing new bucketed percentile output.