Add CLI status JSON regression coverage

[lpc0387]

4. Add CLI status JSON regression coverage

Labels: good first issue, tests, cli

Body:

hermes-collab status --json is listed as a quick way to inspect local state. Add a focused regression test that checks the command returns valid JSON with the expected top-level fields, using existing CLI test patterns.

Suggested scope:

• Look at existing tests under tests/ for CLI invocation style.
• Add one narrow test for status --json rather than broad CLI coverage.
• Assert stable structural fields, not volatile machine-specific values.
• Keep the test independent from real runtime databases, credentials, and agent installations.

Acceptance criteria:

• A new or updated test covers the JSON status command.
• The test avoids brittle assertions on local paths, timestamps, installed agents, or private configuration.
• The narrow test command passes locally, for example PYTHONPATH=src python3 -m unittest tests.test_startup_mode -v or the closest existing CLI test file.
• No production data, secrets, or generated runtime artifacts are required.

Why it is newcomer-friendly:

The task has a small testing surface and can follow nearby unit-test patterns without changing runtime behavior.

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This issue was created from the v5.0 launch backlog in docs/launch/good-first-issues.md.

[Samanyu-dev]

Hi @lpc0387, I would like to work on this issue, Is it possible for you to assign this issue to me?