Add OpenCode skills

ui-variations/templates/preview-summary-template.md

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+# UI Variation Preview
+
+## Target
+
+- Surface:
+- Preview entry point:
+
+## Variants
+
+- A:
+- B:
+- C:
+- D:
+- E:
+
+Remove unused lines if fewer than 5 variants were created.
+
+## Files Changed
+
+-
+
+## Notes
+
+- Shared data/content kept constant across variants:
+- Switcher behavior:
+- Known compromises or follow-up items:
+
+## Next Step
+
+- Waiting for user to choose a winning variation for promotion and cleanup.