chore: update llama-cpp to b7898 and opencode to v1.1.48

- Update llama-cpp from b7867 to b7898
- Update opencode from v1.1.12 to v1.1.48 with improved build process:
  - Replace custom bundle script with official script/build.ts
  - Add shell completion support
  - Add version check testing
  - Simplify node_modules handling
- Update llama-swap service config with new llama.cpp options
- Clarify opencode agent testing workflow in developer and reviewer configs

modules/home/programs/terminal/opencode/config/agents/reviewer.md

@@ -26,6 +26,7 @@ You review code implementations.
 1. Check `git status` - if uncommitted changes, stop and tell @developer to commit
 2. Review latest commit with `git show`
 3. Read full files only if needed for context
+4. Do NOT run tests - you only review code
 
 **Response format:**