fix: preserve Codex activity in Dock tabs

[azooz2003-bit]

This in-org replacement supersedes #11743.

Preserves Codex activity markers and stable title ownership for Dock tabs through transfers, restore, rename, and follow-up child activity. Includes focused lifecycle and ownership coverage.

The replacement is based on the current stacked base and contains only the feature delta, with the external-fork conflict resolved.

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Note

Medium Risk
Changes Dock tab title resolution, persistence, and cross-container transfers for terminal/Codex panels; regressions could mis-save titles or lose activity indicators, but scope is UI/state sync rather than security-critical paths.

Overview
Dock terminal tabs now project Codex lifecycle state (running spinner, idle prefix, etc.) onto the visible Bonsplit title while keeping a stable underlying title for persistence, detach/attach, and rename.

Title ownership and reconciliation

• Tracks per-panel custom title source (user vs auto) through session restore, transfer adoption, rename, and panel teardown.
• Adds stableDockTerminalTabTitle and reconcileCodexTabTitlePresentation so transient Codex markers are stripped when resolving transfers/snapshots and re-applied when agent runtime changes, terminal titles update, or surfaces attach to the Dock.
• Rename uses the stable title in the dialog; clearing/setting a custom title updates provenance and re-reconciles presentation.

Transfer and terminal sync

• Detach metadata resolution prefers stable tab titles for terminals; DetachedSurfaceTransfer title/cachedTitle are mutable so admitted terminal titles can refresh transfer snapshots without baking in decorations.
• Terminal title sync paths route through reconciliation instead of copying displayTitle directly onto the tab.

Tests

• Expands CodexTabTitlePresentationTests for Dock round-trips, lifecycle + rename interactions, restore boundaries, auto/user titles, and remote-titled tabs.

^{Reviewed by Cursor Bugbot for commit 86e1fd6. Bugbot is set up for automated code reviews on this repo. Configure here.}

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Summary by cubic

Preserves Codex activity markers and stable title ownership on Dock tabs through transfers, restore, rename, and lifecycle updates, so spinners and idle indicators no longer get lost or stuck.

Dock title reconciliation

• Tracks custom-title provenance (user vs auto) through transfers and session restore.
• Re-runs Codex title projection on lifecycle changes, rename, attach/detach, and terminal title updates.
• Renaming a running auto-titled tab keeps the running indicator on the stable title.
• Persisted snapshots record custom-title source and remote-title protection for correct restoration.

^{Written for commit 86e1fd6. Summary will update on new commits.}

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Project	Deployment	Actions	Updated
cmux166	Ready	Preview	Sep 11, 2026 8:35pm UTC
cmux41	Ready	Preview	Sep 11, 2026 8:35pm UTC

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