chore(postgres-cli): Bump version to 0.2.6

Published @ruvector/postgres-cli@0.2.6 to npm with PR #59 fixes:
- Use correct Docker Hub image (ruvnet/ruvector-postgres)
- Add PostgreSQL server dev headers for native builds
- Clone full repo for pgrx build instead of minimal crate

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

npm/packages/postgres-cli/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@ruvector/postgres-cli",
-  "version": "0.2.5",
+  "version": "0.2.6",
   "description": "Advanced AI vector database CLI for PostgreSQL - pgvector drop-in replacement with 53+ SQL functions, 39 attention mechanisms, GNN layers, hyperbolic embeddings, and self-learning capabilities",
   "main": "dist/index.js",
   "types": "dist/index.d.ts",