GitHub: Release v0.54.0

What's Changed

• Changelog for v0.53.0-preview.0 by @gemini-cli-robot in #28507
• Changelog for v0.52.0 by @gemini-cli-robot in #28508
• chore(release): bump version to 0.54.0-nightly.20260722.gf743ab579 by @gemini-cli-robot in #28510
• fix(caretaker): sanitize and wrap issue title in untrusted_context by @chadd28 in #28352
• chore(caretaker): update vitest to v3.2.4 and add package-lock.json files by @chadd28 in #28409
• fix(core): rotate session ID on model fallback to prevent stateful API errors by @amelidev in #28469
• feat(caretaker-triage): post comment before auto-closing issues by @chadd28 in #28411
• fix(core): enforce HTTPS for GoogleCredentialsAuthProvider to prevent cleartext leakage by @amelidev in #28517
• fix(core): filter out thought parts from getHistoryTurns when context management is disabled by @DavidAPierce in #28509
• fix(a2a-server): normalize CRLF line endings to LF in getProposedContent by @luisfelipe-alt in #28531
• fix(core): enforce explicit tag length and validation in file keychain by @luisfelipe-alt in #28523
• 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
• fix(patch): cherry-pick f47d6c6 to release/v0.54.0-preview.0-pr-28566 to patch version v0.54.0-preview.0 and create version 0.54.0-preview.1 by @gemini-cli-robot in #28609

Full Changelog: v0.53.1...v0.54.0