Use rich TranscriptEntry kinds in UI parser for pretty output

The UI parser was mapping all OpenCode JSONL events to plain stdout/stderr
transcript entries, causing the Paperclip UI to render everything as raw
terminal output. Updated parseStdoutLine to use structured kinds:

- text events → "assistant" (renders as chat bubbles)
- tool_use events → "tool_call" / "tool_result" (shows tool invocations)
- step_finish events → "result" (shows token/cost metrics)
- step_start events → "system" (shows step transitions)
- assistant events → "assistant" (nested content blocks)

Fixes FAR-43.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@farhoodliquor/paperclip-adapter-opencode-k8s",
-  "version": "0.1.11",
+  "version": "0.1.12",
   "description": "Paperclip adapter plugin that runs OpenCode agents as Kubernetes Jobs",
   "license": "MIT",
   "type": "module",