Add OpenCode skills

ui-variations/references/promotion-checklist.md

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+# Promotion Checklist
+
+Use this checklist after the user selects a winning variation.
+
+## Promote The Winner
+
+- Move the chosen variation into the real production path or component.
+- Rename experiment-oriented files and symbols so the final code reads normally.
+- Update call sites, imports, tests, stories, snapshots, and docs that depend on the old surface.
+
+## Remove Comparison Artifacts
+
+- Delete the preview route or preview-only page if it no longer serves a purpose.
+- Remove the floating variant switcher.
+- Delete losing variations.
+- Remove preview-only helpers, fixtures, state, comments, and wrappers.
+- Remove orphaned styles and unused assets.
+
+## Re-Verify
+
+- Re-run the relevant lint, typecheck, test, or build commands.
+- Verify the real integrated page, not just the preview surface.
+- Confirm mobile and desktop still behave correctly when relevant.
+- Confirm no preview controls or experiment labels remain.
+
+## Report
+
+- State which variation won.
+- State where it was integrated.
+- State what temporary files or routes were removed.
+- State which checks were run and whether anything remains unresolved.