Adds operator-facing `marchwarden costs` subcommand that reads the
JSONL ledger from M2.5.2 and pretty-prints a rich summary:
- Cost Summary panel: total calls, total spend, total tokens (input/
output split), Tavily search count, warning for any calls with
unknown model prices
- Per-Day table sorted by date
- Per-Model table sorted by model id
- Highest-Cost Call panel with trace_id and question
Flags:
--since ISO date or relative shorthand (7d, 24h, 2w, 1m)
--until same
--model filter to a specific model_id
--json emit raw filtered ledger entries instead of the table
--ledger override default path (mostly for tests)
Also fixes a Dockerfile gap: the obs/ package added in M2.5.1 was
not being COPYed into the image, so the installed `marchwarden`
entry point couldn't import it. Tests had been passing because
they mounted /app over the install. Adding `COPY obs ./obs`
restores parity.
Tests cover summary rendering, model filter, since-date filter,
JSON output, and the empty-ledger friendly path. 110/110 passing.
End-to-end verified against the real cost ledger.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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