feat: SmartAssistant v2.4.0 — create_call tool + behavioral rules system

- Add create_call tool: records phone calls as Call entity (not Meeting)
- Add AssistantRule entity: persistent behavioral rules the AI follows
- Add save_rule tool: AI can save new rules when user requests them
- Add systemInstructions to webhook: call vs meeting guidance, open question tracking
- Add recentCalls to case context for AI awareness
- Add AssistantRuleContextProvider: injects active rules per mode into context

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

manifest.json

@@ -3,11 +3,11 @@
     "module": "SmartAssistant",
     "description": "Unified AI Assistant for Legal CRM — floating chat with case memory, office alerts, and AI Gateway integration",
     "author": "klear",
-    "version": "2.3.0",
+    "version": "2.4.0",
     "acceptableVersions": [
         ">=8.0.0"
     ],
-    "releaseDate": "2026-04-05",
+    "releaseDate": "2026-04-06",
     "php": [
         ">=8.1"
     ]