Merge pull request #172 from bookedsolidtech/dev

chore: promote dev → main (sprint PRs #169-171)

Author: himerus

.changeset/preflight-full-validation.md

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+---
+'helixir': patch
+'@helixir/core': patch
+---
+
+Enhance styling_preflight to run all 7 CSS validators in a single call — adds token fallback, scope, shorthand, color contrast, and specificity checks alongside existing shadow DOM and theme compatibility checks

.changeset/regenerate-cem.md

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+---
+'helixir': patch
+---
+
+Regenerate custom-elements.json from source to fix stale CEM data causing cem-validate CI failures

.changeset/validate-css-file.md

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+---
+'helixir': minor
+'@helixir/core': minor
+---
+
+Add validate_css_file MCP tool — validates entire CSS files targeting multiple web components in one call with auto-detection