feat(server): add Antigravity provider

[carterwsmith]

What Changed

Adds Google Antigravity (agy) as a supported provider.

• Supports authenticated, resumable Antigravity chat sessions
• Discovers available models through agy models
• Adds provider status, authentication detection, settings, icons, and documentation
• Integrates Antigravity text generation for titles, commits, branches, and PRs

Why

Google models are not as useless as Theo says

UI Changes

Model selector

Settings panel

Simple demo video
https://github.com/user-attachments/assets/ef25edc7-289b-4608-b750-94b2bdb307c5

Checklist

• This PR is small and focused
• I explained what changed and why
• I included before/after screenshots for any UI changes
• I included a video for animation/interaction changes

---

Note

Medium Risk
New CLI driver that spawns agy (including --dangerously-skip-permissions in full-access) and is enabled by default. Follows existing provider patterns but expands process/auth surface.

Overview
Adds Google Antigravity (agy) as a built-in provider across server, web, mobile, contracts, and docs.

The server driver probes agy --version / agy models, streams NDJSON sessions, resumes via conversation ID, maps plan vs accept-edits and sandbox vs skip-permissions, and supports in-session model/effort switches by restarting the CLI. Text generation (titles, commits, branches, PRs) uses agy -p --json-schema.

Gemini -low/-medium/-high variants are collapsed into one picker row with a Reasoning option. Settings (binaryPath, launchArgs) default enabled. UI/icons, provider order, and install docs are updated accordingly.

^{Reviewed by Cursor Bugbot for commit 62b624b. Bugbot is set up for automated code reviews on this repo. Configure here.}

Note

Add Antigravity (agy) provider across server, web, and mobile

• Introduces a full-stack agy provider: driver, adapter, text-generation, health-check/model-discovery probe, settings schema, and provider registry entry. The default model is gemini-3.7-flash-high.
• Server-side text generation spawns the agy CLI with JSON-schema-constrained I/O and a 180s timeout; commit messages, PR content, branch names, and thread titles are decoded from the CLI's structured output and sanitized.
• Model catalog parsing groups -low/-medium/-high reasoning variants into a single canonical model with a selectable reasoningEffort option. Non-Gemini slugs are flagged as legacy.
• Web UI adds provider selection, settings card, inline SVG icon, and a canonical cross-driver sort order. Mobile adds a matching icon.
• Risk: sortProviderInstanceEntries in providerInstances.ts now orders by BUILT_IN_PROVIDER_ORDER instead of preserving server cross-driver order; unknown kinds fall back to first-seen. getAppModelOptions/getAppModelOptionsForInstance in modelSelection.ts now use getVisibleProviderModels and getBuiltInProviderModelSlugs, so grouped variant slugs are hidden from selection and treated as built-in for custom-model de-duplication.

^{Macroscope summarized 62b624b.}

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[macroscopeapp]

One finding in apps/web/src/components/Icons.tsx: the new AntigravityIcon hardcodes a white fill and drops the className merge that every other brand provider icon in this module uses, so it is invisible in light theme and cannot be recolored by consumers.

^{Posted via Macroscope — UI Consistency}

[macroscopeapp]

Reviewed the new Antigravity Effect code (AgyDriver, AgyAdapter, AgyProvider, AgyTextGeneration) against the Effect service conventions. Service acquisition, Effect.fn-based make functions, subpath namespace imports, and the snapshot probe error handling (static messages plus stdoutLength/errorTag log annotations) all look consistent with the conventions. Two error-modeling issues below.

^{Posted via Macroscope — Effect Service Conventions}

[macroscopeapp]

Approvability

Verdict: Not approved

Macroscope's review found this PR not approvable — This is a substantial full-stack feature that adds a new provider, authenticated CLI session handling, model discovery, text-generation workflows, and default-enabled process execution. The new runtime and permission surfaces are materially broader than a small isolated change.

Notes:

• No code objects were reviewed. Approvability was decided on eligibility alone.

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[cursor]

Cursor Bugbot has reviewed your changes using high effort and found 1 potential issue.

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^{Reviewed by Cursor Bugbot for commit 7140ac6. Configure here.}

[macroscopeapp]

Reviewed the web-side Antigravity wiring (Icons.tsx, providerIconUtils.ts, providerDriverMeta.ts, session-logic.ts, providerModels.ts, modelSelection.ts, providerInstances.ts, ProviderInstanceCard.tsx).

The icon theming issue flagged on the previous revision is resolved: AntigravityIcon now merges className and uses cn("fill-black dark:fill-white", className), matching OpenAI/GrokIcon/CursorIcon/GithubCopilotIcon, so call-site classes and dark mode work as expected. All three provider registration points (icon map, settings driver definitions, picker options) were updated consistently, and the grouped-model helpers in providerModels.ts are no-ops for non-agy drivers, so existing pickers are unchanged.

One non-blocking note on the new cross-driver ordering in providerInstances.ts.

^{Posted via Macroscope — UI Consistency}

[macroscopeapp]

One finding on the Antigravity model-grouping change in the settings card: grouped effort variants are filtered out of the displayed custom-model list, but the add path still accepts and persists them, so the "Add model" action becomes a silent no-op with no way to remove the saved slug.

^{Posted via Macroscope — UI Consistency}