fix: migrate Antigravity preview agent - #2347
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✅ E2E Test Results: ALL TESTS PASSED
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Execution receipt — exact head verified
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Canonical issue
Closes #2346
Outcome
Keeps the optional Agent Factory Antigravity backend compatible after Google shuts down
antigravity-preview-05-2026on 2026-10-05. The replacementantigravity-preview-09-2026was released on 2026-09-17.Official evidence: https://ai.google.dev/gemini-api/docs/changelog#september-17-2026
Scope
Risk
Verification
Run against the exact head:
Then verify all applicable CI, coverage, CodeQL, security, dependency-review, and secret-scanning checks on the head.
Production evidence
Not applicable. This is a fixture-only compatibility migration; live execution remains disabled by default and no provider call or deployment is performed.
Agent handoff
Complete recipe
Prerequisites: Python development dependencies; no Google credential is required for fixture validation.
Shortest build (ESTIMATE: 10–20 minutes):
agent: antigravity-preview-09-2026andenvironment: remote.antigravity-preview-05-2026reference remains in the backend or test.Expected result: the optional backend emits the replacement agent identifier while preserving its remote, bounded, read-only MCP request.
Cost/access: validation costs $0 and needs no provider access. A future live Antigravity call requires separate explicit approval and the provider's public-preview access.
Rollback: revert this PR before merge, or revert its merge commit afterward.