Motivation: just lint fails on clippy::multiple_crate_versions due to hashbrown 0.15 (via sqlx-core -> hashlink ^0.10) and 0.16 (via yew -> indexmap ^2.11).
Constraints: keep yew/yew-router latest, avoid vendoring or git crates, preserve CI via just.
Decision:
Allow clippy::multiple_crate_versions in the lint recipe and crate roots.
Allow duplicate hashbrown/foldhash in cargo-deny bans to keep just deny green.
Remove the exception once SQLx releases a version compatible with hashlink ^0.11 (or the dependency graph otherwise unifies on a single hashbrown).
Consequences:
Positive outcomes: just lint passes while keeping primary deps current.
Risks or trade-offs: reduced lint signal for other multi-version cases; must monitor dependency graph for unintentional splits.
Follow-up:
Implementation tasks: update just lint, add crate-root allows, update deny.toml, document exception in AGENT.md, track in checklist.
Review checkpoints: remove the exception when SQLx adopts hashlink ^0.11 and hashbrown unifies.
Test coverage summary:
Not applicable (lint configuration change).
Observability updates:
None.
Risk & rollback plan:
Remove the lint allow flag and re-run just ci once dependencies align.
Dependency rationale:
No new dependencies; exception is scoped to lint configuration only.