Merge pull request #8 from squareup/changelog

Add CHANGELOG.md

Author: loganj

CHANGELOG.md

@@ -0,0 +1,8 @@
+# Changelog
+
+## Feb 9, 2026
+
+- **Publish to Blockcell** — Publish any document as a standalone HTML site with TOC sidebar, Mermaid diagram support, and a copy-markdown button
+- **Activity feed** — New Recent page shows latest activity across all projects with labels like "edited" and "commented"
+- **Agent context window usage** — See how much of the agent's context window is being used in real time
+- **Fix: sidebar headings** — Headings with bold, italic, code, or links now appear correctly in the sidebar TOC