registry: use symlink_bins in ibmcloud - #9685

Greptile Summary

Fixes the ibmcloud backend so that only actual CLI binaries are exposed on $PATH, preventing extra scripts bundled in the release archive from shadowing system commands like /usr/bin/install. This mirrors the same symlink_bins = "true" option already used by registry/aws-cli.toml and registry/aws-sam.toml.

• Switches the backends entry from a plain string to the inline-table form to attach options = { symlink_bins = "true" }, directing the aqua backend to create a .mise-bins directory containing only symlinks to the declared binaries, and to use that directory as the sole $PATH entry.

Confidence Score: 5/5

Safe to merge — the change is a one-line config addition that follows a well-established pattern in this repository.

The change is a minimal, targeted config update to registry/ibmcloud.toml, adding symlink_bins = "true" to the aqua backend entry. The same option is already used and tested for aws-cli and aws-sam, and the underlying symlink_bins logic in aqua.rs has existing unit/e2e test coverage. There are no logic changes, no new code paths, and no risk of regressions elsewhere.

No files require special attention.

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