fix: add changeset and fix integration test tool count

Adds missing changeset for docs PR. Updates integration
test to include resolve_css_api (67 core tools).

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

Author: himerus

.changeset/library-agnostic-cookbook.md

@@ -0,0 +1,5 @@
+---
+'helixir': patch
+---
+
+docs: make styling cookbook library-agnostic and add validation workflow references

tests/integration/server.test.ts

@@ -140,7 +140,7 @@ describe.skipIf(!SERVER_AVAILABLE)('MCP server integration (with tokensPath conf
       });
     });
 
-    it('returns all expected tool names (66 core + 2 token when configured)', async () => {
+    it('returns all expected tool names (67 core + 2 token when configured)', async () => {
       sendRequest('tools/list', {});
       const response = await recv();
 
@@ -227,6 +227,7 @@ describe.skipIf(!SERVER_AVAILABLE)('MCP server integration (with tokensPath conf
         'check_color_contrast',
         'check_transition_animation',
         'check_shadow_dom_js',
+        'resolve_css_api',
       ];
       const tokenTools = ['get_design_tokens', 'find_token'];
       const expectedTools = [...coreTools, ...tokenTools];