chore: initial MCP preparation package

14-file blueprint including:
- sources.yml with data source provenance
- 12 golden contract tests with native-language search terms
- 5-6 drift detection anchors
- MCP Registry + npm package configs
- Vercel deployment config (SMALL tier)
- Security policies and issue templates

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.gitignore

@@ -0,0 +1,10 @@
+node_modules/
+dist/
+*.db
+!data/.gitkeep
+.env
+.env.*
+*.tgz
+coverage/
+.vercel/
+.DS_Store