feat: per-turn ledger — time, tokens, cost per user turn - #37
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Session summary gains a table with one row per user turn: wall-clock from the user message to the last agent message of the turn, tool calls and errors, input/output/cache tokens and cost summed from assistant usage, with bars scaled to the session maximum so the expensive turn is visible before reading any number. Rows jump to the originating user message. buildTurnLedger lives in lib/pure.ts (also bundled into public/js/pure.js); unit tests cover attribution, content-part tool calls, both cost shapes, total_tokens-only platforms, and the no-usage case.
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Session summary gains a table with one row per user turn: wall-clock from
the user message to the last agent message of the turn, tool calls and
errors, input/output/cache tokens and cost summed from assistant usage,
with bars scaled to the session maximum so the expensive turn is visible
before reading any number. Rows jump to the originating user message.
buildTurnLedger lives in lib/pure.ts (also bundled into public/js/pure.js);
unit tests cover attribution, content-part tool calls, both cost shapes,
total_tokens-only platforms, and the no-usage case.