feat: Add output footer watermark to review results

[ajianaz]

Summary

Add a footer watermark to cora-cli review output so users can easily identify that the review was generated by Cora and which version was used.

Proposed Behavior

Terminal Output

───────────────────────────
Reviewed by Cora v0.1.x
https://github.com/ajianaz/cora-cli
───────────────────────────

SARIF Output

• Include cora.version in runs[0].tool.driver.properties (if not already present)

JSON Output

• Add top-level "cora_version": "0.1.x" field

Scope

• All output formats: terminal (stdout), SARIF, JSON
• Version pulled from env!("CARGO_PKG_VERSION") at compile time — no runtime overhead
• No config needed — always-on, lightweight

Acceptance Criteria

• Footer printed after terminal review output
• SARIF includes cora version in properties
• JSON output includes cora_version field
• Footer only shown when there are results (not on clean diffs)

[ajianaz]

Fixed in v0.2.0