feat: add 5 research tools and blocks framework setup

- Add @tpmjs/tools-page-brief for URL content extraction
- Add @tpmjs/tools-compare-pages for cross-source validation
- Add @tpmjs/tools-source-credibility for credibility scoring
- Add @tpmjs/tools-claim-checklist for factual claim extraction
- Add @tpmjs/tools-timeline-from-text for timeline generation
- Move createBlogPost to packages/tools/official/
- Add blocks.yml for Blocks framework validation
- Update pnpm-workspace.yaml to include official tools

.changeset/add-research-tools.md

@@ -0,0 +1,21 @@
+---
+"@tpmjs/tools-page-brief": minor
+"@tpmjs/tools-compare-pages": minor
+"@tpmjs/tools-source-credibility": minor
+"@tpmjs/tools-claim-checklist": minor
+"@tpmjs/tools-timeline-from-text": minor
+---
+
+Add 5 new research tools for AI-powered content analysis
+
+New tools using AI SDK v6 beta (tool() + jsonSchema() pattern):
+
+- **@tpmjs/tools-page-brief**: Fetch URL and extract summary with key points and claims needing citations
+- **@tpmjs/tools-compare-pages**: Compare two URLs for agreements, conflicts, and unique points
+- **@tpmjs/tools-source-credibility**: Calculate heuristic credibility score based on domain signals
+- **@tpmjs/tools-claim-checklist**: Extract checkable factual claims from text
+- **@tpmjs/tools-timeline-from-text**: Extract dated events and return normalized timeline
+
+All tools are stub implementations ready for full logic implementation.
+
+Also moved @tpmjs/createblogpost to packages/tools/official/ directory and set up blocks.yml for Blocks framework validation.