The team-mode wiring at `createEventHandler` extracted
`pluginContext.client.session.promptAsync` and `.status` into a fresh
wrapper object. The methods were copied by reference, so the prompt-async
gate's `session.promptAsync.bind(session)` was binding to that plain
wrapper rather than the underlying SDK `Session` instance. The opencode
SDK's `promptAsync` reads `this._client.post(...)`, so production calls
threw `TypeError: undefined is not an object (evaluating 'this._client')`
on the very first dispatch — fingerprinted in /tmp/oh-my-opencode.log as
688 `background-agent-parent-wake`, 47 `model-suggestion-retry`, and 4
`team-idle-wake-hint` failures over the past three days.
Move the wrapper construction into `buildTeamIdleWakeHintClient`, which
preserves the narrow factory contract while binding both methods back to
the SDK `Session` so `_client` survives the dispatch. Cover the contract
with four BDD-style tests including the historical destructure-only
failure mode so any future regression is caught at unit-test time.
YeonGyu-Kim