Add aegisctl status command for a quick health overview

[saivedant169]

Problem

To check if AegisFlow is running correctly today, you have to curl /health, curl /admin/v1/providers, and maybe check the dashboard. Three commands for something that should be one.

Acceptance criteria

• New command: aegisctl status
• Prints a one-screen summary:
  • Gateway reachable (yes/no) and response time
  • Admin API reachable (yes/no)
  • MCP gateway reachable if enabled
  • Number of pending approvals
  • Number of active credentials if credential broker is enabled
  • Last audit entry timestamp
  • Policy pack currently loaded (if detectable)
• --json flag for machine-readable output
• Exit 0 if everything is healthy, 1 if any required component is down

Files to touch

• cmd/aegisctl/status.go (new, or extend main.go if there is already a stub)
• cmd/aegisctl/main.go to wire the subcommand
• cmd/aegisctl/status_test.go (new)

How to test locally

# Start AegisFlow
./bin/aegisflow --config configs/demo.yaml

# In another terminal
./bin/aegisctl status
# Expected: a short table with all components green

./bin/aegisctl status --json
# Expected: JSON with the same fields

Notes

Look at how the existing admin API endpoints are structured in internal/admin/admin.go. You should not need any new admin endpoints for this, just new client code that calls the existing ones.