Implements JSON output support

[boblangley]

No description provided.

[Copilot]

Pull request overview

This PR implements JSON output support for the MinVer CLI tool, allowing users to retrieve version information in machine-readable JSON format alongside the existing text format.

Key Changes:

• Added --format CLI argument to support both text and JSON output formats
• Made core data structures serializable by adding serde::Serialize derive macros
• Implemented JSON formatting that includes all version components and calculation metadata

Reviewed changes

Copilot reviewed 6 out of 7 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
crates/core/src/version.rs	Added Serialize derive to Version struct for JSON serialization support
crates/core/src/lib.rs	Added Serialize derive to CalculationResult struct for JSON output
crates/core/Cargo.toml	Added serde dependency with derive features
crates/cli/src/main.rs	Implemented OutputFormat enum and JSON output logic with format selection
crates/cli/Cargo.toml	Added serde_json and serde dependencies for JSON serialization
crates/cli/tests/cli.rs	Added integration test verifying JSON output format and content

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