v8.5.9

What's Changed

🐛 Fixes

• tailer: stabilize run_blocking_* tests under parallel-test load by @siropkin in #964
• tailer: isolate flaky run_blocking_* tests behind #[ignore] + dedicated CI step by @siropkin in #966

Other Changes

• chore: strip issue/PR/cross-repo refs from source comments by @siropkin in #954
• chore: strip ADR references from source and e2e scripts by @siropkin in #955
• chore: strip round and milestone labels from source and scripts by @siropkin in #956
• chore: rewrite e2e script headers to describe behavior, not ticket history by @siropkin in #957
• chore: replace README ADR link with self-contained prose by @siropkin in #958
• chore: drop back-compat shims that only bridge historical transitions by @siropkin in #960
• ci: add no-internal-refs scanner to enforce the comment policy by @siropkin in #961
• chore: drop remaining back-compat shims by @siropkin in #963

Full Changelog: v8.5.8...v8.5.9