test: add command validation and vs code integration tests

[Arthurvroum]

No description provided.

[Copilot]

Pull request overview

This PR replaces the placeholder extension test with basic VS Code extension activation/command-registration checks and adds unit tests around CLI parameter validation, helping ensure the extension wires up correctly and rejects unsafe command-line inputs.

Changes:

• Add VS Code integration tests to verify the extension is present, activates, and registers expected commands.
• Add unit tests for parseAndValidateParams to validate safe flags and reject shell-injection payloads.
• Ignore .vscode-test/ artifacts in .gitignore.

Reviewed changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated 3 comments.

File	Description
src/test/extension.test.ts	Replaces the sample test with extension presence/activation and command registration checks.
src/test/command.test.ts	Adds unit coverage for CLI param parsing/validation against safe and malicious inputs.
.gitignore	Adds .vscode-test/ to keep VS Code test artifacts out of the repo.

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