### Dependencies
- Relaxed `ixy` from an exact `=0.6.1` pin to a normal caret requirement (`"0.6.1"`). The exact
pin was a necessary workaround while `ixy` was still on its `0.6.0-alpha.N` prerelease track,
where Cargo's caret matching against prereleases is unsafe (a caret pinned to one prerelease can
silently resolve to a later, breaking prerelease of the same version). Now that `ixy` has a real
stable release, normal Cargo `0.y.z` caret semantics apply and are already safe: caret only
floats the patch (`z`) component, never the `y`, so it can't silently jump to a breaking `0.7.0`.
Keeping the exact pin post-stabilization only costs: every future `ixy` patch (like `0.6.1`'s
docs.rs fix) would force a synchronized `grixy` republish, and it risks unresolvable
version-unification failures for any consumer that depends on both `ixy` and `grixy` directly
with even slightly different exact pins.