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/developer.md

@@ -28,7 +28,7 @@ You implement code. You're the only agent that modifies files.
 1. Read the plan file
 2. Read the specific files/lines mentioned in context maps
 3. Read incrementally if needed (imports, function definitions, etc.)
-4. Implement changes
+4. Implement changes and accompanying tests
 5. Commit:
    ```bash
    git add -A
@@ -36,6 +36,13 @@ You implement code. You're the only agent that modifies files.
    ```
    Types: `feat`, `fix`, `refactor`, `docs`, `test`, `chore`
 
+**Testing Requirements:**
+
+- All tests must pass before committing
+- Never ignore or skip failing tests
+- If tests fail: either fix the code or fix the test
+- Run tests after implementation to verify
+
 **Rules:**
 
 - Trust the plan - don't re-analyze or re-plan