`/api/cancel` stopped a turn only by SIGINTing a child process whose argv0 is
`claude`, so on an ACP agent it reported "no claude process to interrupt"
and the turn ran on. The serve loop now stores the session's canceller on
the `Bus` when the runtime has one, and `/api/cancel` uses it: the agent is
sent `session/cancel`, and the next wake prompt carries the interrupted hint,
as for a signalled claude turn. Without a canceller (claude), the SIGINT path
is untouched.
An ACP turn stopped by the idle watchdog (`HIVE_TURN_IDLE_SECS`) becomes
`TurnError::AgentStall(note)`, handled like `ApiStall`: park for
`HIVE_STALL_SLEEP_SECS`, requeue, and record `api_stall`. The TurnEnd note
is the runtime's message (how long the agent was silent, whether it had to
be killed, and that a silently retried provider error such as HTTP 429
looks like this), not the claude-specific `ApiStall` text. A cancel the
agent ignores is a `Failed` turn.
Refs #4391
The #2595 job-queue rework replaced hive-bash-mcp's direct broker send
with a todo push through the in-agent socket, so a bash-task-driven
turn now wakes with from == "todo", never "bash-task-<id>". This
branch has had nothing to match since, so it silently bucketed no
turns under the bash-task label; removed rather than left dead.
Closes#2256.
Closes the #3110 split — lib.rs is now just the crate doc comment and
the pub mod list.
journal.rs's new doc comment fixes a pre-existing bug: the old
JournalPriority doc text in lib.rs was actually half Capability's doc
(a leftover from an earlier reorder that moved the code but not the
comment above it).
