chore: final pre-submission polish for JOSS

- Add CITATION.cff for GitHub citation support and Zenodo/JOSS integration
- Fix ossim reference URL in references.bib (was pointing to unrelated repo)
- Remove broken favicon reference from index.html (no public/ directory exists)
- Add meta description to index.html
- Fix sidebar title inconsistency: "Process Simulator" → "Process Scheduler Simulator"
- Rebuild dist.tar.gz with production assets

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

package.json

@@ -1,7 +1,7 @@
 {
   "name": "pss",
-  "version": "1.1.0",
-  "description": "O Process Scheduler Simulator é uma ferramenta educacional interativa que roda inteiramente no navegador",
+  "version": "1.2.0",
+  "description": "Process Scheduler Simulator — an interactive educational tool that runs entirely in the browser",
   "main": "index.js",
   "scripts": {
     "dev": "vite",