- 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.
- Lowered the default session scan limit for edits and tools from 100000 to 1000 and updated usage text to match.
- Reworked grand-total and per-tool table rendering in session-stats to compute aligned column widths and include an aggregated "(N others)" row.
- Tuned the session-stats release profile by replacing full stripping with line-tables-only debug symbols and disabled split debuginfo stripping.
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