Release v0.55.0-nightly.20260806.g761f604c1

What's Changed

• fix(cli): fall back to embedded macOS seatbelt profiles if missing by @amelidev in #28551
• feat(pr-generator-core): add environment config parser, command executor, GitHub R… by @joneba-google in #28435
• feat(pr-generator-orchestrator): implement iterative bug-fixing state machine and container worker entrypoint by @joneba-google in #28433
• feat(pr-generator-infra): configure Cloud Run job, Workflows definition, and Dockerfile by @joneba-google in #28431
• fix(release): handle npm dist-tag deletion failures on registries that forbid it by @DavidAPierce in #28694
• fix(core): stop a new user message fusing into an unanswered tool response by @adamfweidman in #28700
• fix(core,cli): repair /compress session reload and quota-fallback tool response loss by @adamfweidman in #28672
• fix(core): preserve functionCall thoughtSignature when stripping thought parts by @sarbojitrana in #28607
• fix(core): unwrap and parse nested gaxios streaming errors from cause message by @luisfelipe-alt in #28689

New Contributors

• @sarbojitrana made their first contribution in #28607

Full Changelog: v0.55.0-nightly.20260803.gf47d6c6f7...v0.55.0-nightly.20260806.g761f604c1