#23921 acpmux: a turn a daemon restart cut off resumes by itself, before the queue behind it

Leo's exact words: "ACPMUX daemons, peer routing and messaging across machines."

A daemon restart can interrupt a turn after its agent host has exited. Before this change, acpmux marked that turn outcome_unknown and immediately ran prompts queued behind it, leaving the interrupted work idle until a person typed “continue”.

This PR makes the restart recovery resume the interrupted turn first:

• During log recovery, append one idempotent continuation before the outcome_unknown result. The continuation uses the cut prompt's next attempt id (<prompt>~resume-<n>), quotes the original prompt and steers, and records _meta.provenance.kind=auto_resume with reason=daemon_restart.
• Restore it through the ordinary durable queue and move it to the head, including the crash window before queue_order is written. Prompts queued behind the cut turn remain behind it and each runs once.
• Preserve the cut turn's control, trust gate, and kept prompt images. A Web steer keeps the resumed turn in Web control and re-enters the folder trust gate.
• Respect autoResumeDelaysMs: [] and stop a restart chain after the existing four-attempt bound.

Leo's call is limited to daemon restart recovery; the daemon update schedule and trigger remain in #23199.

Changelog

Fixed: acpmux resumes a turn interrupted by a daemon restart before running prompts queued behind it.

Verification

• Hosted focused verification run 40017332381 on exact head 598b2a5b4bc5b229b3fdf56f0ca3882e642ce178: selected durable-agent test, Rust MSRV, Go pane, and daemon artifact jobs passed.
• Hosted Linux/macOS clippy failures are base-red: both report the unrelated base file cmux-tui/crates/cmux-tui-core/src/mux/resource_topology/creation_settlement.rs:35, which this PR does not touch.
• Local rustfmt --edition 2024 --check and git diff --check pass. Native app builds were not run locally.

Risk: risk:normal.

Agent session: huge-blue