[trissim]

Fix the label's lifetime

The retained ChannelPrompt traceback came from PromptTextArea's deferred callback querying a footer sibling. The editor was mounted; the sibling label was not. Checking the editor again cannot make that label exist.

Each PromptTextArea now creates and owns its original EditingModeLabel. Shared Prompt.compose mounts that exact label in the same InfoBar. The existing mode/focus hook updates its owned object directly; no cross-sibling DOM query or retry remains. This covers native, mailbox and channel prompts through the same inherited composition. Recomposition gives each editor its own label, so an old callback cannot update another editor's label.

An initial reactive-watch attempt was corrected on this PR: Neovim mutates its mode object in place and uses the existing show_editing_mode hook. The final change preserves that hook, the original after-refresh call, display calculation and focus behavior. No new flag, event family, cache or silent lookup guard.

Native NRA plans: .verification/editing-mode-label/. Final source compiles and diff check passes.

Original focused controls — red, not claimed green

Two original native-editor/channel controls ran. Both stopped before their final assertions at NEOVIM STARTING; 2 failed in 35.55s. The final direct-owner version was checked with the same two controls: 2 failed in 37.29s at the same startup boundary.

The shared /home/ts/code/projects/agent-comms/.venv has no prepared share/toad/neovim/0.12.4 payload. NeovimHost starts Neovim().command(), which uses sys.prefix and refuses that missing prepared executable. No dependency was installed around the declaration. These results do not establish end-to-end Neovim behavior. Source tracing establishes removal of the failing DOM lookup while preserving the original mode-update hook. No additional app test or profile is running; the exact helper PIDs 1119158 and 1119298 have exited.

Retained logs: /home/ts/.cache/agent-scratch/codex-latency/editing-mode-{label,owned-label}-check.log. Landing as a recoverable owner fix; installation joins the coordinated batch, no competing installer.

Other reported error

The exact command_catalog WorkerFailed trace also ends in RosterSidebarRead._cached_model, already fixed in Core #4670. It does not establish a separate registry_for defect.

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[github-actions]

debt-src at bbcd60b blocks on 2 lines:

grew StringIdentity:.verification/editing-mode-label/author.py +2
grew StringIdentity:.verification/editing-mode-label/owned_label.py +1