Summary

• initialize parent_thread_id in the compressed rollout test fixture's SessionMeta
• restore rollout test compilation across Bazel test, clippy, release-build, and argument-comment-lint jobs

Root cause

PR #25087 (Read compressed rollouts and materialize before append) added codex-rs/rollout/src/compression_tests.rs in merge commit a8a6071279b6f3112fcc5fc3fee69c48473d7149. Its write_rollout fixture constructs SessionMeta without the required parent_thread_id field, causing error[E0063] when Bazel compiles rollout-unit-tests-bin on main and downstream PRs.

Validation

• UV_CACHE_DIR=/private/tmp/codex-uv-cache just fmt
• just test -p codex-rollout (59 tests passed; bench smoke passed)
• git diff --check
• manually audited the touched Rust diff for positional literal argument comments; the change adds no positional callsite

Local lint blocker

• just argument-comment-lint could not reach source inspection locally because Bazel's LLVM dependency fails analysis: compiler-rt/BUILD.bazel glob include/sanitizer/*.h matched no files.