- Add missing AI intents: generate_cover_letter, improve_resume, request_view_contact, auto_apply_job, unknown
- Add is_internal_admin helper to prevent admin/super_admin users from using user-facing AI flows
- Add admin guards to: ai_generate_job_field, ai_generate_cover_letter, ai_tailor_resume, ai_auto_apply, ai_auto_respond_to_lead
- Add professional approval check in ai_auto_respond_to_lead - must be APPROVED status
- Add tracecoin balance check before contact reveal (requires 30 tracecoins)
- Add KB escalation: when no articles found, suggest creating support ticket
- Add explicit unknown intent handler with helpful message
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