Return a failure status from doctor checks

[juliosuas]

What changed

• make ghost doctor return exit status 1 when a hard-error check fails
• preserve both JSON and human-readable output before exiting
• cover both CLI output modes with regression tests

Why

Hard-error doctor checks were rendered correctly but still returned a successful process status, so scripts could not distinguish healthy output from a failed diagnostic.

Proof

• .venv/bin/python -m ruff check ghost tests
• .venv/bin/python -m ruff format --check ghost tests
• .venv/bin/python -m pytest -q (59 passed)
• Terminal output behavior is covered in tests/test_investigator.py

Safety

• This supports authorized security research, journalism, law enforcement, or self-audits
• No private target data, secrets, generated databases, reports, or investigation artifacts are committed
• No new collection behavior is introduced

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: bb2eac14-40a4-41e1-97ba-8ecdf50798df

📥 Commits

Reviewing files that changed from the base of the PR and between b1792a3 and a0d9e46.

📒 Files selected for processing (2)

• ghost/ui/cli.py
• tests/test_investigator.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch agent/doctor-schema-contract

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