[split 2/3] Reborn queued-message steering into busy threads

[ilblackdragon]

Summary

Split 2 of 3 extracted from #5279. Stacked on #5962 (codex/reborn-other-hardening) — review/merge that first; this PR targets its branch so the diff is just the queued-steering slice.

Queue a user message sent to a busy thread as active-run steering input, and surface queued status in the WebUI.

• Input queue: durable FilesystemHostInputQueue + InMemoryHostInputQueue (loop_support), HostInputEnqueuePort / RejectingInputEnqueue, CAS-guarded run-scoped persistence.
• Steering gateway: product_workflow/steering.rs (enqueue_busy_steering, typed SteeringEnqueueError); busy-submit returns DeferredBusy; mark_message_queued_or_replay.
• Thread transitions: Queued message status + Queued → Submitted on both thread backends (idempotent per run).
• Agent loop: prompt_context_cursor consume, post-tool steering drained before the reply model call, model-port coalescing of consecutive text-only user messages.
• Runtime wiring: Filesystem/InMemory host input queue selection; with_input_enqueue on webui / openai-compat / slack inbound.
• Chat frontend: queued/optimistic message status (message-status.js, optimistic-message.js), strict invocationId gate-argument join (gate-arguments.js), gate-kinds.js, generic gate-kind title, tool.error* i18n.
• Tests: real WebUI → runtime → tool-loop queued-followup e2es; thread/loop-support/agent-loop contracts.

Notes

• cargo check --tests --features webui-v2-beta green; focused chat JS tests pass.

🤖 Generated with Claude Code

[ironloopai]

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[gemini-code-assist]

Code Review

This pull request implements active-run steering queues, allowing user messages sent to a busy thread to be queued as steering input for the active run instead of being rejected. It introduces a durable, filesystem-backed FilesystemHostInputQueue alongside an in-memory fallback, adds a new Queued message status, and updates the executor pipeline to drain and acknowledge these inputs correctly. Additionally, consecutive plain-text user messages are now coalesced before being sent to the provider gateway, and the WebUI has been updated to support queuing composer sends, exact tool-activity argument mapping for approval gates, and localized tool error messages. I have no feedback to provide as there are no review comments to assess.

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[railway-app]

🚅 Deployed to the ironclaw-pr-5963 environment in ironclaw-ci-preview

Service	Status	Web	Updated (UTC)
ironclaw	✅ Success (View Logs)	Web	Jul 10, 2026 at 10:03 pm

[ilblackdragon]

Obsolete: based on #5279's pre-refactor base. main has since refactored (crate rename ironclaw_reborn→ironclaw_runner, error_summary→error_detail, WebUI JS→TS). Replaced by the forward-ported stacked split #5981 (queue) → #5982 (budget).