fix: reconcile CLI and Desktop messages by canonical identity

[Astro-Han]

Summary

Refs #3633

This is replacement PR 2 after #3721 and #3716 landed on main.

• CLI and Desktop now generate one stable messageId before ordinary send or Follow Up admission, render that LocalIntent immediately, and submit the same identity through turn.message.submit.
• Runtime Host remains the only delivery/lifecycle authority. Its admission result says only turn_started, steering, or followup; the Host subscription introduces the real Turn, while queue projection describes only the live queue.
• Canonical transcript and live steering rows reconcile the transient row in place by messageId. Sparse historical ranges omit latest transients without deleting them; latest replacement, reconnect, remount queue echo, and terminal refresh preserve or deterministically replace them.
• Desktop ordinary sends no longer arm/rebind a renderer-owned live Turn or manufacture an empty Turn. Explicit orchestration still uses exact turn.start; Side Conversation keeps its independent fix(desktop): bind Side Conversation events to Host admission #3716 admission and event ownership.
• CLI Enter, mid-turn steering, and Alt+Enter Follow Up share one submission seam. The old steer/queueMessage fallback outcome, CLI delivery retry ownership, and six obsolete fallback-only skipped tests are removed.

Before: optimistic rows and Host rows could have different identities, stale transcript replacement could erase the tail, and ordinary admission could create an empty pseudo Turn. After: the submitted message is immediately visible once, stays at one timeline position, and is replaced only by the canonical row with the same identity.

Verification

• Rebased onto live origin/main at e9d314fd8a15a906d1323c599a1bd300a312d174.
• Built affected workspaces: @maka/core, @maka/storage, @maka/runtime, @maka/runtime-host, @maka/ui, @maka/desktop main, and maka-agent.
• 393 focused tests passed across Desktop composer/Follow Up admission, queue/remount projection, streaming handoff, UI materialization, CLI transcript/TUI long-running turn behavior, Runtime Host driver, and root-turn coordinator.
• Coverage includes active Turn send, immediate Follow Up, two successive sends, canonical transcript advance, stale terminal events, sparse replacement, remount/reconnect queue echo, and cross-client follow-up message identities.
• Scoped Biome check and git diff --check passed. Repository-wide tests were not run locally; CI owns that coverage.

Authority boundaries

• No Runtime Host storage, settlement, recovery, provider/root proof, or durable lifecycle authority changed.
• Transcript remains presentation authority; Host queue and handoff events are transient projections.
• CLI and Desktop own LocalIntent presentation only. They do not own delivery, retry, settlement, or recovery.
• fix(desktop): bind Side Conversation events to Host admission #3716 Side Conversation/Quote Companion fork, admission, Stop, event ownership, and disposal/retry semantics are unchanged.

AI use

• No generative tool made a substantive contribution
• Generative tooling made a substantive contribution

Tool(s) and scope: Codex authored the implementation, tests, simplification audit, and PR text under human review. Claude was consulted for an independent architecture critique. Material commits retain Generated-by: Codex trailers.

Checklist

• Tests cover the change and fail without it
• Lint, format, typecheck and the affected suites pass locally

Does this PR entail a change in behavior?

• Yes — described under Summary above
• No

[Astro-Han]

Update on bda2eccf2d:

[P2] busy-race fallback leaves ghost transient row

When renderer thinks idle but host is busy (another window/Bot/Goal continuation holds root), startTurn throws session_busy and falls back to submitMessage({messageId: renderer turnId}). Host then creates a new turnId for the turn while the durable message id stays as renderer turnId. The IPC returns host turnId without messageId, and renderer uses host id for optimistic row — never matches durable id → permanent duplicate (transient ghost).

Fix: return messageId on the turn_started branch and prefer it as transient key; add test for busy→turn_started path.

Note: PR is still draft; this review is preparatory and pending re-review after head stabilizes.

简体中文

busy 情况下回退导致重复行。