Remove workspace inheritance for external consumption

[findolor]

Motivation

When rain.metadata crates are consumed as path dependencies from external repositories (via nested submodules), cargo cannot resolve workspace inheritance fields. This causes build failures when traversing the dependency chain.

Solution

Replace workspace inheritance in all crates with explicit values:

• crates/bindings/Cargo.toml
• crates/metaboard/Cargo.toml
• crates/cli/Cargo.toml

Checks

By submitting this for review, I'm confirming I've done the following:

• made this PR as small as possible
• unit-tested any new functionality
• linked any relevant issues or PRs
• included screenshots (if this involves a front-end change)

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch fix/workspace-inheritance

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