Daemon creates a root context, cancelled on SIGTERM. Sessions derive
their context from it. Agent turns derive from session ctx. Tools
get the turn ctx.
Signal propagation:
- SIGTERM → daemonCancel() → all session ctxs cancelled → agent turns exit
- User interrupt → agent.Interrupt() (SIGINT equivalent, turn-level only)
- Session kill → sess.Cancel() → that session's agents stop
Previously sessions used context.Background() — daemon shutdown had
no automatic propagation to running agents.
Types moved from ollie/session to ollie/agent:
AgentConfig, AgentConfigPath, AgentsDirs, BuildRuntime, Load, Event,
PersistedAgent, LoadPersistedAgent, RestoreHistory, PromptEnv,
History, Runtime, ErrInterrupted, WatchState.
ollie/session is no longer imported directly in top-level 9p/ files
or mgr/format.go and mgr/sessionfile.go (they only need agent types).
WatchAgent const inlined as string literal.
Rename the internal olliesrv/session package to olliesrv/mgr to resolve
the naming conflict with ollie/session (the core session package).
This allows importing ollie/session without an alias — the temporary
`agent "ollie/session"` scaffolding is removed. All references now
use the natural package name: session.X for core types, mgr.X for the
9P session manager.
Levi Neely