Add --per-snapshot flag for snapshot-level chunk usage breakdown#21
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Add --per-snapshot CLI option that shows a column-aligned per-snapshot table (Unique Size / Shared Size / Total Size) below each guest summary when used with --all-guests or a single --searchpath. When combined with --csv-dir, an additional CSV file (snapshots_*.csv) is written with per-snapshot columns: namespace_path, snapshot_name, unique_bytes, shared_bytes, total_bytes, unique_chunks. The overall guest-level summary remains identical to the existing implementation -- per-snapshot breakdown is computed as extra data from the same index file analysis.
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When running with --all-guests or a single --searchpath, the new --per-snapshot flag shows a column-aligned table below each guest summary with per-snapshot breakdowns (Unique Size / Shared Size / Total Size), newest snapshot first.
Combined with --csv-dir, an additional snapshots_*.csv file is written with per-snapshot detail.
The existing guest-level summary output is unchanged — the snapshot breakdown is extra data computed from the same analysis pass.
Sample output: