fix(pricing): alias grok-proxy to Grok Build - #1123

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## TL;DR

Selective re-implementation of the new upstream OpenUsage commits that
still apply on Runway: Codex auto-review stays a first-class model in
spend breakdowns and prices as GPT-5.6 Luna from 2026-07-09, and Grok
CLI's `grok-proxy` slug resolves to Grok Build.

## What was happening

- Upstream has moved on since the last port wave (Runway #101–#108).
Each new OpenUsage commit was reviewed against Runway's architecture,
existing ports, and the "don't bloat" bar.
- Codex still replaced `codex-auto-review` with its dated GPT fallback
before aggregation (openusage robinebers#1085), so the breakdown showed gpt-5.5
instead of auto-review.
- That fallback table still stopped at gpt-5.5 (openusage robinebers#1125). OpenAI
moved auto-review onto GPT-5.6 Luna on 2026-07-09, so every auto-review
event since July was priced 25× too high.
- Grok CLI now logs `grok-proxy` for Grok Build (openusage robinebers#1123); that
slug had no alias, so those tokens were dropped from the spend tiles.

## What this changes

- Parser keeps the measured `codex-auto-review` slug and stores the
dated GPT fallback on `Event.pricingModel` only for cost. Aggregation
keys the rate cache by both slugs so a day that spans the Luna cutoff
does not reuse the first event's rates.
- Adds `("2026-07-09", "gpt-5.6-luna")` at the top of the auto-review
fallback table (ours; ccusage's snapshot still stops at gpt-5.5). Bumps
the Codex JSONL cache schema to 2 so already-remapped events are
reparsed.
- Aliases `grok-proxy` → `grok-build-0.1` and stamps `updated_at` with a
same-day ISO timestamp so the feed wins over today's date-only cache.
- Documents the auto-review identity/pricing split on the Codex
spend-tiles page.

## Heads-up

Reviewed and **not** ported, with reasons:

- **openusage robinebers#1116 / robinebers#1127** (mandatory daily analytics ping, PostHog
bump) — Runway removed analytics in #9.
- **openusage robinebers#1111 / robinebers#1106** (scroll / reorder / SVG parse) — Runway
already has `ReorderFrameStore`, parsed-once `ProviderMark`, row-local
reorder gestures, and the rebuilt popover scroll path. Taking their
patch would duplicate and fight that work.
- **openusage robinebers#1033** (Reset All Settings) — Runway already has Reset
All Customization; a second Settings-wide reset is extra surface, and
earlier port waves already skipped it.
- **openusage robinebers#1128** (Sparkle 2.9.5 → 2.9.6) — relevant security bump,
but this environment cannot refresh `Package.resolved`'s `originHash`.
Dependabot is already scheduled weekly; worth a dedicated follow-up.
- Pricing/provider commits through robinebers#1112, robinebers#1108, robinebers#1110, robinebers#1109, robinebers#1105,
robinebers#1103, robinebers#1101, robinebers#1097, robinebers#1093, robinebers#1089, robinebers#1087, robinebers#1050, robinebers#1019, robinebers#1082 are
already in `main`.

## Tests

- New parser tests: auto-review lines keep the slug; post-2026-07-09
lines price as Luna; the 2026-07-08/09 boundary stays gpt-5.5.
- New aggregation tests: breakdown shows `codex-auto-review` while
costing the fallback; Luna and gpt-5.5 auto-review events on either side
of the cutoff keep independent rates (guards the rate-cache key).
- `grok-proxy` resolves to the same rates as `grok-build-0.1`.
- This environment is Linux, so `swift test` could not be run here. CI
on `macos-26` is the compile/test gate.
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Co-authored-by: Cursor Agent <[email protected]>