feat(pricing): the repricing is dated — encode the switch, a /pricing/ page, a pricing command

[lroolle]

Summary

DeepSeek dated its repricing on 2026-08-13: peak/off-peak billing on a new, higher card from 2026-08-16 16:00 UTC, peak hours 01:00-04:00 and 06:00-10:00 UTC (boundaries defined in UTC) at twice the off-peak rate. That flips the TASTE.md rejection of 2026-08-05 exactly as its expiry clause prescribed: the multiplier goes in, gated on the effective instant, never applied before it.

One schedule, four readers:

• internal/deepseek: PriceAt / CostAt / PeriodAt / NextChange switch cards on the instant; estimates and ds models follow automatically. Tests pin the flip boundary, the UTC end-exclusive windows, and the next-change arithmetic at fixed instants.
• deepseek pricing (new command): the billing period right now with local, UTC and Beijing time, when it changes, and both cards — computed locally from the same schedule the estimates use, no network, nothing spent. --json for scripts.
• gateway meter: the same switch, plus Estimate reserves against the highest card an in-flight request could touch within the hour, so admission control cannot under-reserve across a boundary.
• site: a dedicated /pricing/ page wired into nav, sitemap, llms.txt and the 404, carrying the dated schedule, both rate cards, and a "right now" strip. The strip is data-driven: build.py renders one schedule list as the visible table, the no-JavaScript verdict, and the JSON that pricing.js reads; pricing.test.js pins the period arithmetic against the committed HTML and the upstream ground truth, and runs in make site-check and CI.

Consistency guards: the embedded docs corpus is refreshed to the 2026-08-13 upstream (pricing, updates, V4-Pro GA news), so ds docs show quick_start/pricing, the site and the estimates trace to one source; make price-check still passes with the four rate-card literals mirrored between the CLI and the gateway. News page gets the dated-repricing entry, and the two undated announcements (2026-08-06 rise, 2026-06-29 peak policy) are resolved and point at it. Site copy stays em-dash-free.

Test plan

• make check (fmt, vet, go tests, corpus-check, price-check, build, gateway, site-check incl. node site/pricing.test.js) — all green locally
• deepseek pricing / deepseek pricing --json smoke-tested; flat card shown today, flip announced with countdown
• generated HTML verified em-dash-free; page carries every number of both cards

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