each turn_stats row already records the model; roll it up per bucket
so the /stats page can show which model ran when. model choice
greatly affects token cost, so the new stacked-bar chart sits right
under the cost chart for eyeball correlation across the window.
Snapshot gains a sorted `models` series list; each Bucket carries a
`model_counts` map.
new hive-ag3nt::stats module reads turn_stats.sqlite read-only and
aggregates over 24h/7d/30d windows (hourly/daily buckets) — turn
rate, p50/p95/avg duration, ctx tokens (avg/max), cost token
components, top tools, wake mix, result mix. served by the agent
itself so per-MCP extensions can register more providers without
the host knowing their schemas.
/stats route + /api/stats?window=... on the per-agent web ui.
chart.js v4.4.4 pulled from jsdelivr (SRI hash deferred). nav
links: 📊 chip on the dashboard container row + 📊 stats → on
the per-agent header.
todo housekeeping: softened damocles-area note at the top,
new reverse-proxy + deferred reminder-rollup items, removed
the two telemetry-ui items absorbed by this page.
