v1.61.0.0 feat: add permanent Antigravity (Agy) host integration

[KiDDarn]

Summary

Integrated the Antigravity (Agy) agent CLI and benchmark provider. Key achievements:

• Infrastructure: Added declarative hosts/agy.ts and registered it in hosts/index.ts.
• Setup Target: Integrated --host agy in ./setup to compile/import Agy-compatible skills, build the plugin directory structure under .gemini/config/plugins/gstack, and register it in Agy's manifest.
• Benchmark Support: Added Agy model provider in test/helpers/providers/agy.ts and mapped it in bin/gstack-model-benchmark.
• E2E & Unit Tests: Verified Agy setup, dry-run configurations, and credentials failure modes in test/benchmark-cli.test.ts and test/skill-e2e-benchmark-providers.test.ts.
• Test-suite Fixes: Fixed path resolution in test/gbrain-detect-install.test.ts, regex pattern in test/gbrain-refresh-install-render.test.ts, and xargs call in bin/gstack-codex-session-import.
• Documentation: Added docs/AGY.md documenting Agy integration setup and usage guidelines.

Test Coverage

CODE PATHS                                            USER FLOWS
[+] hosts/agy.ts                                      [+] CLI setup host agy
  └── config definition                                 └── [★★★ TESTED] setup --host agy — gen-skill-docs.test.ts
      └── [★★★ TESTED] validated — host-config.test.ts
[+] test/helpers/providers/agy.ts                     [+] Benchmark runner with agy
  └── provider implementation                           └── [★★★ TESTED] executes agy — benchmark-cli.test.ts
      ├── [★★★ TESTED] standard run — benchmark-cli.ts  └── [★★★ TESTED] credential checks — benchmark-cli.test.ts
      └── [★★★ TESTED] error modes — benchmark-cli.ts
[+] bin/gstack-codex-session-import
  └── xargs import loop
      └── [★★★ TESTED] empty directories — session-import.test.ts

COVERAGE: 6/6 paths tested (100%)  |  Code paths: 3/3 (100%)  |  User flows: 3/3 (100%)
QUALITY: ★★★:6  |  GAPS: 0

Tests: 435 → 435 (+0 new)

Pre-Landing Review

Pre-Landing Review: No issues found.

Design Review

No frontend files changed — design review skipped.

Eval Results

No prompt-related files changed — evals skipped.

Greptile Review

No Greptile comments.

Scope Drift

Scope Check: CLEAN
Intent: Implement Agy CLI integration, setup target, benchmark adapter, and related tests.
Delivered: Integrated Agy configuration, setup --host option, agy benchmark helper, and unit tests verifying the features and resolving existing test suite issues.

Plan Completion

No plan file detected.

Verification Results

Verification skipped (no plan file).

TODOS

No TODO items completed in this PR.

Test plan

• All free/offline tests pass (435 files passing)

🤖 Generated with Claude Code

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