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>

.vercelignore

@@ -0,0 +1,9 @@
+node_modules
+__tests__
+fixtures
+scripts
+src
+*.md
+!README.md
+tsconfig.json
+.github