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Clicking Resume on a chat-UI row could only reveal an already-open tab. If the chat had been closed, or this process had never published it, the click re-read an inventory that did not contain it and toasted "Retry in a moment" — advice that could never come true, because nothing republishes an unpublished tab. The legacy `claude --resume` fallback is deliberately refused for structured-owned rows, so the row had no way back at all. `close` already keeps the record and the journal on disk so a session can be attached again, and the hold path already resurrects one in full. What was missing was the tab: `restoreReadableSessions` is latched to run once, at startup, so nothing could ask for a single session later. Adds `agentSession.reveal`. The host looks up its own record, restores the session readable, and republishes the tab through the same call `agentSession.create` uses. Deliberately narrow: - It takes no hold. A provider child exists because a surface asked, and the chat pane asks when it binds. - A journal it cannot read is not a refusal. A chat whose journal predates the SQLite store restores to nothing here, but attach still recovers it, so the tab is published and the pane's hold finishes the job. - Workspace and provider come from the record, never the client, so a session id alone cannot aim the publication at another workspace. Claude and Codex both, by construction: eligibility is `adapterSupportsRecord`, which the router answers from the record's own provider. Gated on a new advertised capability rather than probing for method_not_found, matching agent-session.structured.hold.v1 — absence is visible during negotiation instead of by calling.