* feat(orcad): gate agent launches on accounts and cancel feature waits for departed callers
requires: may read the parsed params, so terminal.create and
session.tabs.createTerminal wait on accounts only when they start an
agent; plain shells stay ungated. createAgentSession, ensureAgentSession,
agentSession.create, agent.launch (unless it reuses a terminal),
git.generateCommitMessage and the worker-launching orchestration methods
also wait on accounts. The feature wait races the request signal and the
connection close and refuses without running the handler.
* feat(orcad): gate terminal.ensureAgentSession only for explicit launches
An attach to an existing session is restore latency and needs no fresh
account state; only kind 'explicit' may start an agent.
* test: reset orcad feature readiness after every unit test
A startOrcad test that fails partway left latches closed, so later tests
in the same worker could wait 10 s on a gated method.
Neil
4049bc77d6