fix(core): lifecycle management, bounded caches, and memory safety across 11 crates#13

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dviejokfs wants to merge 9 commits intomainfrom

feat/postgres-backup-sidecar

Commits on Feb 19, 2026

feat(providers,backup,core): pg_dump sidecar backup, preset registry, and error hardening
dviejokfs
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Commits on Feb 20, 2026

fix(core): lifecycle management, bounded caches, and memory safety across 11 crates
dviejokfs
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fix(environments): remove useless .into() conversions on chrono::Utc::now() in tests
dviejokfs
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Commits on Feb 21, 2026

fix(backup): switch pg_dump to plain format to fix OOM and add error logging
dviejokfs
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