manifest v6.8.0

✨ Minor Changes

• 19e2d5b: Kiro subscriptions now connect in Manifest Cloud. Kiro previously used a local-only CLI flow (reading the kiro-cli token cache off the backend's own disk), so it only worked when self-hosting. It now uses the AWS SSO OIDC device authorization flow server-side — register → show a user code + verification link → poll for the token — exactly like the GitHub Copilot and MiniMax subscriptions, working identically on a laptop and in the cloud.

🐛 Patch Changes

• 8061e86: Show capability badges for gateway models in the model picker. A gateway model like opencode-go/glm-5.1 now resolves its capabilities from the underlying provider's models.dev metadata (zai / glm-5.1) instead of showing "Capabilities unknown". The resolution is gateway-generic — it keys off the shared gateway-prefix abstraction, so any gateway added later inherits it automatically.
• b13ac3d: Add Grok subscription provider support with xAI OAuth login and dynamic xAI model discovery.
• 20c7c40: Add NVIDIA NIM as an official API-key routing provider.
• f71c741: Show OpenCode Go's per-request cost in the model picker and tier cards. OpenCode Go bills a per-request slice of its dollar quota rather than a flat fee, so models with a published cost now display e.g. $0.0136/req instead of the generic "Included in subscription" label. The available-models API surfaces cost_per_request (from the OpenCode Go catalog) for gateway models; flat-fee subscriptions are unchanged.