[trissim]

Paired with Core OpenHCSDev/agent-comms#2860. Core head 36542eb3cf42bce729ae3da7565e75bddc2a201d; Toad head bc51609. They land together under the commander's paired order.

An old viewer cannot read a root that a new runtime owns. Rather than turn that correct refusal into FailedObservation, the root's attachment result now hands the viewer to the recorded owner:

• comms_root.py:372-390: RootRuntime.attachment(...).proceed selects the existing attach body or app.succeed_onto before Comms is constructed. No prefix comparison or exception translation lives here.
• app.py:216-218: succeed_onto calls from the preparation worker onto the app thread, exits with Succeeded(runtime), then cancels that old worker so it cannot continue opening the root.
• application_lifetime.py:25-45: the existing lifetime owner declares TerminalOutcome, Ended and Succeeded. Ended prints the existing VersionMonitor notice. Succeeded validates its supplied runtime and execs its toad entrypoint with sys.argv[1:] and runtime.environment(os.environ), like Core's claimed bridge replacement.
• app.py:198-214: the app uses Textual's single return-value slot, initialized to Ended; exit converts Textual's omitted result into Ended and preserves an explicit Succeeded. The typed return_value reads that same slot. There is no second outcome store or isinstance dispatch.
• cli.py:26-40: existing crash persistence and nonzero error handling remain; the returned terminal outcome owns finish().
• Earlier source changes release service-opening and ACP-attachment route borrows at the end of those operations, not at the end of the viewer/process lifetime.

Startup answer: NO, this head does not reopen the saved open-tab roster. app.py:440-444 calls ApplicationLifetime.start, whose application_lifetime.py:149-157 opens home or one explicit --session. TabOrder starts empty at tab_order.py:14. #1162 is still draft and owns roster restoration; none is built here.

Both mains were merged and both published heads match ls-remote. No tests, app launch or practice install ran in Drafts; the review fork runs the pair. Earlier copied-app results used old heads: idle installs succeeded, but history remained Loading messages and replacement refused the old runtime. Those old observations do not prove this new handoff.

Assumed: succession is entered from the existing preparation worker; Textual's normal shutdown retires existing app resources; the recorded runtime contains the paired toad executable; argv/root selection survives exec through its existing arguments/environment; open-tab restoration remains #1162. The core prefix/maintenance guard remains authoritative.

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