Establish OpenCode compatibility certification corpus

fixtures/expected/current-status-idle.json

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+{
+  "full_text": "current ok",
+  "reasoning_text": "",
+  "tool_count": 0,
+  "prompt_blocked": false
+}

fixtures/expected/delta-before-part.json

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+{
+  "full_text": "tail drop recovered",
+  "reasoning_text": "",
+  "tool_count": 0,
+  "prompt_blocked": false
+}

fixtures/expected/interactive-prompts.json

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+{
+  "full_text": "",
+  "reasoning_text": "",
+  "tool_count": 1,
+  "prompt_blocked": false,
+  "tool": {
+    "tool": "question",
+    "status": "completed",
+    "callID": "call_question",
+    "opencode_request_id": "que_fixture"
+  }
+}

fixtures/expected/legacy-idle.json

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+{
+  "full_text": "legacy ok",
+  "reasoning_text": "",
+  "tool_count": 0,
+  "prompt_blocked": false
+}

fixtures/expected/multi-step-usage.json

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+{
+  "full_text": "two steps",
+  "reasoning_text": "",
+  "tool_count": 0,
+  "prompt_blocked": false,
+  "total_cost": 0.46,
+  "total_input_tokens": 30,
+  "total_output_tokens": 10
+}

fixtures/expected/reasoning-and-final.json

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+{
+  "full_text": "final answer",
+  "reasoning_text": "considering carefully",
+  "tool_count": 0,
+  "prompt_blocked": false
+}

fixtures/expected/unknown-event.json

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+{
+  "full_text": "still works",
+  "reasoning_text": "",
+  "tool_count": 0,
+  "prompt_blocked": false
+}