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* fix(orchestration): let worker-start actually produce a structured chat `orchestration.workerStart` reads the user's "open agent tabs in chat" default, but two placement checks downgraded a structured-preferring worker to a PTY terminal agent for the two flags a routine dispatch always passes: --worktree new-child / new-top-level -> worktree_creation --model / --effort -> launch_preferences so in practice a structured worker never happened. launch_preferences was stale. PR #19040 gave AgentSessionAttachParams `options` and added resolveStructuredLaunchSeedOptions, which narrows a saved selection to exactly `model` and `effort` — the two ids both structured providers accept as strings. --model/--effort now go through that same narrowing (extracted as narrowStructuredLaunchSeedOptions) and seed the worker's session instead of forcing a terminal. An option set that narrows to nothing resolves to undefined, never `{}`, which would fail the record's bounded-string guard under a code that is not a wire refusal and strand the launch with no fallback. worktree_creation was a consequence of createWorkerWorktree creating agent-first: its startup terminal WAS the worker, so the structured branch below it was unreachable for any new worktree. A structured worker now creates the worktree with no startup agent and creates its session for the worktree afterwards — the order the renderer's own structured worktree create already uses. Because the executing host can only answer agentSession.createSupport for a workspace that exists, that verdict moved after creation: a refusal (WSL, and the rest) becomes a terminal agent in the worktree just created, never a failed start. --on and --terminal still downgrade, with their reasons intact, and every remaining downgrade still states itself in the mode receipt. The wait-for-setup gate is preserved explicitly. A PTY worker got it for free — agent-first creation sequences the agent's startup command behind the setup runner, so tui-idle could not arrive until setup exited. A structured session has no startup command to sequence, so the gate is now awaited directly, bounded by the start's own timeout. Split out worker-worktree-creation.ts and worker-start-agent-placement.ts rather than growing two files that were both pinned at the max-lines cap. * refactor(native-chat): make shared feasibility authoritative for launch routing * Type the structured setup gate's absent blocked reason so the wait union stays property-typed The type-aware audit rejected the blocked-reason template literal: narrowing the wait union with an 'in' check left the field typed unknown. Declaring that a structured setup gate never carries a blocked reason restores the direct read. --------- Co-authored-by: Merge Sim <sim@local>