OpenCode provider: second message fails with "JSON-RPC input closed"

[tvtjr]

Environment:

• Claudian v2.0.16
• OpenCode CLI v1.15.6
• Windows
  Bug:

1. Select OpenCode provider with model opencode/deepseek-v4-flash-free
2. First message works normally (responds in ~9s)
3. Second message immediately fails with Error: JSON-RPC input closed (~1s)
4. Model discovery works fine (11 models discovered)
5. No errors in Obsidian developer console
   Analysis (provided by OpenCode CLI during debugging):
   The error originates from AcpJsonRpcTransport at line 73038-73040 when the subprocess stdout closes. The ACP protocol itself is stable — directly tested opencode acp from Node.js and multi-turn conversations work perfectly. The subprocess stays alive through initialize, session creation, prompt, cancel, and second prompt.
   The issue appears to be on the plugin side: something calls cleanup() or shutdownProcess() between turns, killing the ACP subprocess before the second prompt can be sent.

[tvtjr]

Note: This report was found and generated by OpenCode's v4-flash-free model. I just copied it here. I'm not sure whether its analysis of the bug is correct, but the problem does indeed exist.