chore(changeset): add v3.0.0 major release notes

Author: simonguo

.changeset/config.json

@@ -0,0 +1,11 @@
+{
+  "$schema": "https://unpkg.com/@changesets/config@2.3.1/schema.json",
+  "changelog": "@changesets/cli/changelog",
+  "commit": false,
+  "fixed": [],
+  "linked": [],
+  "access": "public",
+  "baseBranch": "main",
+  "updateInternalDependencies": "patch",
+  "ignore": []
+}

.changeset/v3-major.md

@@ -0,0 +1,20 @@
+---
+"react-code-view": major
+"@react-code-view/react": major
+"@react-code-view/core": major
+"@react-code-view/unplugin": major
+---
+
+Major refactor for v3.0.0:
+
+- Hook: stabilize `useCodeExecution` (refs-based options, stable `execute()`, `updateCode` alias)
+- Tests: fix TypeScript matcher types and marked renderer signature; remove unused vars
+- Docs: update README with requirements, hook example, CI/CD notes
+- CI: Node 18 + PNPM, caching; gh-pages publishes `docs/dist`
+- Publish: adopt Changesets + npm provenance (OIDC), drop `NODE_AUTH_TOKEN`
+- Config: align workspace tsconfig/turbo/vite
+
+BREAKING CHANGES:
+
+- `useCodeExecution` effect behavior stabilized; consumers relying on previous implicit re-execution may need to explicitly update `code` or pass `dependencies`
+- Package structure reorganized across `packages/*`; import paths may need updates according to exports