Release v0.55.0-nightly.20260729.g3499c84f7

What's Changed

• chore/release: bump version to 0.54.0-nightly.20260728.gbef611950 by @gemini-cli-robot in #28552
• feat(pr-generator-db): implement Firestore concurrency dual-locking and test ingestion utilities by @joneba-google in #28432
• feat(pr-generator-agent): implement Antigravity agent runner and prompt templates … by @joneba-google in #28434
• fix(core): skip merged function-response turns when finding the active loop by @adamfweidman in #28565
• chore(release): bump version to 0.55.0-nightly.20260728.gd29268d36 by @gemini-cli-robot in #28569

New Contributors

• @joneba-google made their first contribution in #28432

Full Changelog: v0.54.0-nightly.20260728.gbef611950...v0.55.0-nightly.20260729.g3499c84f7