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>

.github/ISSUE_TEMPLATE/data-error.md

@@ -0,0 +1,39 @@
+---
+name: Data Error Report
+about: Report incorrect, missing, or outdated legal data
+title: "[DATA] "
+labels: data-error, triage
+assignees: ''
+---
+
+## Data Error Report
+
+### Which law or provision is affected?
+
+**Law/Act name:**
+**Section/Article number:**
+**Jurisdiction:** IL
+
+### What is wrong?
+
+- [ ] Incorrect text
+- [ ] Missing provision
+- [ ] Outdated version (amendment not reflected)
+- [ ] Incorrect citation/URL
+- [ ] Missing cross-reference
+- [ ] Other (describe below)
+
+### Expected content
+
+Please provide the correct text or a link to the official source:
+
+### Official source URL
+
+Link to the authoritative source showing the correct content:
+
+### Additional context
+
+Any other information that would help us fix this issue.
+
+---
+*This MCP uses automated drift detection to catch upstream changes. If you're seeing stale data, it may already be flagged in our monitoring.*