feat: add JSON output support to CLI commands

[Jiya3177]

Summary

Add JSON output support to selected Typer CLI commands.

Related Issue

Fixes #33

Type of Change

• Bug fix
• New feature
• Documentation
• Refactoring
• Test changes
• CI/Chore

Testing

• uv run ruff check passes
• uv run mypy passes
• uv run pytest passes
• Manual testing done

Manual testing:

• PYTHONPATH=src python3 -m pytest tests/cli/test_new_cli.py
• python3 -m ruff check src/oss_dev/cli/app.py tests/cli/test_new_cli.py

Note: Full test suite was run and has unrelated existing/environment failures around Gemini API key, GitHub PR fallback behavior, and macOS temp path resolution.

Description

Added a --json flag to:

• oss-dev discover repos
• oss-dev discover issues
• oss-dev issues list
• oss-dev analyze

When --json is passed, the commands now print valid structured JSON and skip the default formatted text output. Existing text output remains unchanged when --json is not provided.

Added CLI tests using CliRunner and json.loads() to verify JSON output for all updated commands.

[Hell1213]

Review: JSON output support for CLI commands

Hi @Jiya3177, clean implementation.

Verified: Tests pass (77/77, including 5 new JSON tests), ruff checks clean.

Looks good: The --json flag pattern with early return is clean and the _echo_json helper is reusable. Good test coverage.

One consideration: Adding indent=2 to json.dumps(data) in _echo_json would make the output more human-readable, but not essential.

Important: PR #48 by @geetanunakani also modifies src/oss_dev/cli/app.py (adds progress bars). Both PRs change the same function bodies (discover_repos, discover_issues, issues_list, analyze). Merging both will require reconciling the --json early returns with the progress bar context managers.

[Hell1213]

The --json flag approach is straightforward and the tests cover all four commands. Early return pattern keeps it clean. Good work.

[Jiya3177]

Hi @Hell1213,

I rebased the branch, resolved the conflicts with the progress-bar changes, updated the affected test accordingly, and CI is now passing.

The only remaining failing check is Gitleaks. I didn't add any credentials or secrets in this PR, so could you please share the specific Gitleaks finding or log output? I'll address it right away if there's a false positive or something I missed.

Thanks!