feat: set CLI version to 0.3.0

[akriaueno]

Summary

• bump the crate version to 0.3.0 so why --version reports the intended next release version
• make the Nix package read its version from Cargo.toml
• add CI checks for CLI version output and release tag/package version mismatch

Testing

• cargo +stable test --locked — 16 passed
• CI version check command — expected=why 0.3.0, actual=why 0.3.0
• nix run nixpkgs#actionlint -- .github/workflows/ci.yml .github/workflows/release.yml
• nix build && ./result/bin/why --version — why 0.3.0

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 0468ac2f-607e-4f56-8d38-a067560980ee

📥 Commits

Reviewing files that changed from the base of the PR and between 35f8af6 and 3e00bb6.

⛔ Files ignored due to path filters (1)

• Cargo.lock is excluded by !**/*.lock

📒 Files selected for processing (4)

• .github/workflows/ci.yml
• .github/workflows/release.yml
• Cargo.toml
• nix/package.nix

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feature/version-0.3.0

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