The opencode channel forwarded to `opencode run` without isolating the
operator's interactive environment. claudecode already neutralises via
`--setting-sources project --strict-mcp-config`; opencode had no equivalent.
When the operator runs a plugin suite that swaps the global default agent at
runtime (e.g. OhMyOpenCode's rotating Greek-codename agents), headless
`opencode run` crashes resolving a default agent that no longer exists
("default agent ... not found"), and the crash trace is sent back to DingTalk
as the bot reply. Verified by reproducing in a clean /tmp dir: plain
`opencode run` crashes, `opencode run --pure` replies normally.
Add --pure to the opencode argvTail so the bot answers in a clean,
plugin-free environment, consistent with the claudecode channel.
修雨
c16c4aa59a