conductor(track): Complete OpenCode Configuration Overhaul

- Updated metadata.json status to completed
- Fixed corrupted plan.md (was damaged by earlier loop)
- Cleaned up duplicate Goal line in tracks.md

Checkpoint: 02abfc4

conductor/tracks/opencode_config_overhaul_20260310/metadata.json

@@ -2,7 +2,7 @@
   "id": "opencode_config_overhaul_20260310",
   "title": "OpenCode Configuration Overhaul",
   "type": "fix",
-  "status": "planned",
+  "status": "completed",
   "priority": "high",
   "created": "2026-03-10",
   "depends_on": [],