feat(agentci): add tests and Gemini 3 tiered batch pipeline
- Add 15 tests for pkg/agentci/config.go (load, save, remove, list, round-trip)
- Extend dispatch_test.go from 4 to 12 tests (match edge cases, ticket JSON
serialization, model/runner variants, execute error paths)
- Add gemini-batch-runner.sh: rate-limit-aware tiered pipeline using
Flash Lite → Gemini 3 Flash → Gemini 3 Pro with 80% TPM safety margin
- Generate docs/pkg-batch{1-6}-analysis.md covering all 33 packages
using ~893K tokens total (vs 5.54M single-shot), zero rate limit hits
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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