Refactor project name from "Open Claude Design" to "Open Design"

- Updated project name in package.json, package-lock.json, and README files.
- Changed CLI commands and references from "ocd" to "od".
- Adjusted file structure references in documentation and code to reflect new naming conventions.
- Enhanced .gitignore to include new runtime data files.
- Updated metadata in LICENSE file to match new project name.

skills/magazine-poster/SKILL.md

@@ -17,7 +17,7 @@ triggers:
   - "long-form poster"
   - "杂志海报"
   - "报纸版式"
-ocd:
+od:
   mode: prototype
   platform: desktop
   scenario: marketing
@@ -67,7 +67,7 @@ Sunday paper. Long-form, deliberate, type-driven.
    - Background uses a creamy paper tint (`#f3eee2` or DS canvas) plus a
      subtle paper noise (`radial-gradient` dots at low opacity).
    - 2-column body grid via CSS Grid; min-width 1100px page.
-   - `data-ocd-id` on header, headline, deck, each cell, footer.
+   - `data-od-id` on header, headline, deck, each cell, footer.
 5. **Self-check**:
    - Type hierarchy is unmistakable — headline owns the page.
    - Strikethrough + italic accent both appear, exactly once each.