feat: add Grok SuperGrok / X Premium+ OAuth backend#18
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Add a grok cloud backend that authenticates via xAI subscription OAuth (browser PKCE or device-code), stores tokens in auth.json, refreshes automatically, and calls OpenAI-compatible chat completions at api.x.ai. Wire /login, /logout, /auth, /backend, /doctor, setup, and a Grok-specific stock system prompt so subscription traffic works without an API key.
Append the active model id and backend base URL to the per-turn status footer so it is always clear which endpoint handled the request.
Document /login grok, the grok backend, default model, and env overrides in the README and Unreleased changelog.
Grok now uses the same default system prompt as every other backend.
… work Keep SuperGrok OAuth backend changes and bring in remote 1.2.1 compaction-model work. Resolve CHANGELOG/README conflicts by retaining both feature sets.
Keep cargo fmt --check clean after the Grok OAuth and footer work.
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Motivation
Small Harness already supports cloud backends with API keys (OpenAI, OpenRouter, etc.), but SuperGrok / X Premium+ users often have subscription access without a separate API key workflow. Today that means either configuring a key manually or skipping Grok entirely.
This change adds first-class Grok OAuth so subscription users can log in once, keep credentials in the normal auth store, and use Grok like any other backend—without pasting secrets into config.
Summary of changes
UI
/login grok,/logout,/auth,/backend grok,/doctor, and first-run setup for the new backendBackend
grokcloud backend backed by xAI OAuth (browser PKCE or device-code)auth.json, then call OpenAI-compatible chat completions atapi.x.aiVerified by
cargo fmt --all -- --checkcargo clippy --all-targets -- -D warningscargo test(567 passed)Screenshots
Backend selector with new
grokoptionModel selector for new
grokbackendTurn footer with new backend and endpoint indicators