detect_mode_availability accepts a pre-computed dep_status so the agent
probes once; interface and fallback paths now have content-level tests.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
utils/capabilities.py now owns interface detection and mode
availability; the agent delegates via detect_interfaces() and
detect_mode_availability(). The agent keeps config gating and
tool_details population to preserve its result shape exactly.
The moved fallback path uses utils.dependencies.check_tool instead of
the agent's old shutil.which fallback; check_tool also searches
Homebrew paths, a strict superset (strictly better detection).
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
James Smith