Drop Rust reader crate

[Copilot]

Removes the code0-definition-reader Rust crate from the repository. Only the CLI and TypeScript reader remain.

Deletions:

• crates/package/ - entire Rust reader implementation

Workspace updates:

• Cargo.toml - removed crates/package from workspace members
• Cargo.lock - regenerated without reader dependencies

Documentation:

• README.md - removed Rust reader installation and usage documentation

CI/CD:

• .github/workflows/ci.yml - removed package build/test job
• .github/workflows/release.yml - removed publish-rs-reader job

Original prompt

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This section details on the original issue you should resolve

<issue_title>Drop Rust Reader Crate</issue_title>
<issue_description></issue_description>

<agent_instructions>Drop the rust reader crate completly.

Not just delete the folder but also adjust the cli, readme and other occurrences!</agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes Drop Rust Reader Crate #178

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