feat: Add --check flag to mi6 status for hook verification

Problem

mi6 status shows "ENABLED" based on whether hooks are configured in settings files, but does not verify hooks actually work. Users can have hooks configured but broken (e.g., mi6 not in PATH, permission issues).

Current behavior:

$ mi6 status
Framework     Status      Method
Claude Code   ENABLED     plugin
Gemini CLI    ENABLED     config hooks

User assumes everything works, but hooks may be silently failing.

Proposed Solution

Add --check flag that actually tests hook execution:

$ mi6 status --check

Framework     Status      Method         Verified
Claude Code   ENABLED     plugin         hooks responding
Gemini CLI    ENABLED     config hooks   hooks responding
Codex CLI     ENABLED     config hooks   hooks not responding (!)

Warning: Codex hooks are configured but not responding.
  - Check that mi6 is in your PATH
  - Run: which mi6

Implementation Approach

1. For each enabled framework, invoke a lightweight test:

``bash
mi6 ingest event --test --framework claude
``

1. The --test flag would:

• Skip database write
• Return success/failure quickly
• Verify the command can be invoked

1. Alternative: check if recent events exist from that framework

``sql
SELECT COUNT(*) FROM events
WHERE framework = 'claude'
AND created_at > datetime('now', '-1 hour')
``

Scope

• New --check flag on mi6 status
• Lightweight verification (< 100ms per framework)
• Clear actionable output when verification fails
• Optional: --check could be default behavior (with --fast to skip)