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## Summary - Keep an Xtream refresh generation protected for its complete lifetime so orphan cleanup cannot delete active staging artifacts between B+Tree batches. - Hold cleanup ownership through deletion and remove inactive generation artifacts, sidecars, and guards as one coordinated unit. - Publish Xtream category snapshots on Windows with an atomic write-through rename while preserving the existing Unix parent-directory durability barrier. - Add deterministic regression coverage for cleanup races, active generations, stale sidecars, atomic category replacement, and partial-publication errors. ## Root cause The orphan sweep previously used an instantaneous sidecar-lock probe as proof that a refresh generation was inactive. Legitimate unlocked intervals between B+Tree batches created a race in which active staging data could be removed. The category publisher also reused the Unix directory-sync approach on Windows. The rename could succeed before opening the parent directory failed, causing the refresh to report a misleading partial-publication error. ## Validation - `make fmt-check` - `make lint` - `cargo +stable clippy --workspace --all-targets --all-features -- -D warnings` - `make test` — 3100 backend tests passed, 5 ignored; integration and documentation tests passed - `make markdown-lint` - Focused Xtream cleanup and category-publication regression tests Closes #817 Closes #818 * **Bug Fixes** * Improved cleanup of outdated Xtream refresh data while protecting active refreshes from accidental deletion. * Added safer handling for incomplete, invalid, or locked refresh data. * Improved reliability when publishing refreshed category data across supported platforms. * Added stricter validation to prevent unrelated files from being removed.