docs: move skills to the official .opencode/skills directory for default recognition

Author: LSantha

.skills/update-wiki.md .opencode/skills/update-wiki.md.skills/update-wiki.md renamed to .opencode/skills/update-wiki.md

@@ -69,5 +69,5 @@ JNode is a Java operating system with custom JVM. ~3,300 Java files, 25 assembly
 - **Persistence Rule**: Any changes made to the `.wiki/` directory MUST be manually pushed using `git push` from inside that directory. The OpenCode auto-push mechanism DOES NOT cover the `.wiki` folder.
 - **Reporting**: After a successful push, always provide the URL to the updated wiki page in your final issue comment.
 - **Wiki schema**: See `WIKI_SCHEMA.md` for structure and maintenance rules
-- **Skills**: Check the `.skills/` directory for specialized workflows (e.g., `update-wiki.md`).
+- **Skills**: Check the `.opencode/skills/` directory for specialized workflows (e.g., `update-wiki.md`).
 - **LLM agents**: Read `.wiki/index.md` first to locate relevant wiki pages for your task