fix(deps): patch RUSTSEC-2026-0204 (crossbeam-epoch 0.9.20) - #29
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Lockfile-only bump of the transitive crossbeam-epoch (0.9.18 -> 0.9.20), pulled in via the iggy SDK (crossbeam, moka) and metrics-exporter-prometheus (metrics-util). The advisory's invalid pointer dereference lives in fmt::Pointer/Display for Atomic/Shared on null pointers; this crate never formats crossbeam types directly, so exposure was indirect, but the advisory has failed the weekly scheduled audit gate since 2026-07-13. cargo deny check advisories passes locally; 183 lib / 18 model / 1 smoke tests green. Fixes #28
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Summary
Closes the only open issue (#28, auto-filed by the scheduled audit on 2026-07-13): RUSTSEC-2026-0204, an invalid pointer dereference in
crossbeam-epoch0.9.18'sfmt::Pointer/Displayimpls for nullAtomic/Sharedpointers.cargo update crossbeam-epoch→ 0.9.20 (semver-patch; 96 other locked deps untouched)CHANGELOG.mdgains an Unreleased Security entryTier-A change per the graduated review cadence (single-package lockfile patch bump): verification is
cargo deny check advisories(passes locally), the full test suite (183/18/1 green locally, integration in CI), and the CI matrix.Fixes #28