fix: always include Health Packages section in KB — empty state says "not configured"

When zero active packages exist, the KB silently omitted the section.
AI then responded "I couldn't find that" for package queries. Now always
includes the section header with explicit "not configured" guidance.

Also removed contradicting rule 8 (bullet points) — conflicts with the
structured output format that requires plain text sentences.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/config/ai.defaults.ts

@@ -123,7 +123,6 @@ RULES:
 5. For clinic info, timings, packages, insurance → answer directly from the knowledge base below. If the knowledge base is empty for that section (e.g. no packages configured), say the feature isn't set up yet instead of "I couldn't find that".
 6. Be concise — agents are on live calls. Under 100 words unless asked for detail.
 7. NEVER give medical advice, diagnosis, or treatment recommendations.
-8. Format with bullet points for easy scanning.
 
 RESPONSE FORMAT (STRICT):
 You MUST respond with valid JSON in this exact format — no markdown fences, no extra text, just raw JSON: