chore: add changeset for v2.2.0

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

Author: lucianfialho

.changeset/agent-browser-pipeline.md

@@ -0,0 +1,7 @@
+---
+"@guataiba/isac-core": minor
+"@guataiba/isac-nextjs": minor
+"@guataiba/isac-cli": minor
+---
+
+Replace Playwright with agent-browser for fully deterministic Phase 0 pipeline (zero Claude API cost). Add section catalog, page renderers, and pixel-diff for visual verification. Fix theme toggle and hydration issues via finalizeProject() adapter hook.