docs: add pricing-update skill for syncing the pricing supplement

[robinebers]

TL;DR

Adds a pricing-update agent skill (like release-swift) that walks through syncing pricing_supplement.json with Cursor's published model pricing, and links it from the pricing docs.

What was happening

• Since feat(spend): native log scanners + dynamic model pricing, drop ccusage #827, supplement updates (new Cursor-native models, price corrections, alias rules) are a manual edit with the procedure spread across docs/pricing.md, the publish workflow, and the supplement file itself.
• There was no single runbook an agent could follow, so each sync required rediscovering the conventions (alias ordering, validation, per-million rates, PR flow).

What this changes

• New .claude/skills/pricing-update/SKILL.md: pull https://cursor.com/docs/models-and-pricing.md into context, diff against the supplement, edit (with guardrails: exact numbers, prefer catalog aliases over duplicated prices, never delete historically-referenced entries, -fast rules before base rules, bump updated_at), validate with the same checks CI runs plus the pricing tests, open a PR, and verify the gh-pages publish afterwards — including the re-trigger command for stalled Pages deploys.
• docs/pricing.md maintainer notes now point to the skill.

Tests

• Docs/skill only; no code changes.

Made with Cursor

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