chore: bump altimate-core to 0.2.6

Picks up extractMetadata fixes:
- Aggregate function names (COUNT, SUM, AVG, etc.) now in functions array
- IN (SELECT ...) and EXISTS (SELECT ...) subquery detection
- Any/All quantified comparison subquery detection (guarded)

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

Author: anandgupta42

bun.lock

@@ -78,7 +78,7 @@
     "@ai-sdk/togetherai": "1.0.34",
     "@ai-sdk/vercel": "1.0.33",
     "@ai-sdk/xai": "2.0.51",
-    "@altimateai/altimate-core": "0.2.5",
+    "@altimateai/altimate-core": "0.2.6",
     "@altimateai/drivers": "workspace:*",
     "@aws-sdk/credential-providers": "3.993.0",
     "@clack/prompts": "1.0.0-alpha.1",