Provide context-efficient JSON verbosity levels

[stef-k]

Closes #92

Summary

• Add explicit compact and debug completed-analysis JSON modes while preserving bare --json compatibility.
• Filter only normalized pass findings in compact mode, retaining all guards, states, scope totals, policies, ordering, and unchanged actionable findings.
• Keep debug byte-identical to bare full JSON and preserve existing version, skill-management, error, and exit behavior.
• Document the modes and record the feature under the Unreleased changelog.

Validation

• python -m unittest tests.test_json_modes — 3 passed.
• python -m unittest discover -s tests — 291 passed.
• Bare/debug stdout byte-equivalence — passed.
• Compact, version, skill-management, invalid-choice, and JSON-error CLI probes — passed.
• git diff --check main...HEAD — passed.
• Code Guard exact changed-file review — only the retained non-blocking print_text complexity REVIEW.