[barelyworkingcode]

Closes #597

PR 2 of 2 for #597 (epic #596). The agents board gets Adopt on an idle, adoptable live outside row and Interrupt and adopt on a working one. Both share one row-action builder with Drop in, Resume and View read-only.

• Route. POST /api/outside-sessions/:id/adopt with body {interrupt}. Eve checks the id shape and the boolean, then makes one relayTransport.fetch('POST', '/api/sessions/adopt', {outsideId, interrupt}) with no scope. That is the owner-class path Drop in uses, never the chief-of-staff scope. claudeSessionId is dropped from the answer.
• Fail closed. The button shows only when relay says adoptable === true. A row that is not adoptable shows relay's reason in one line from a fixed text table. A door refusal shows a one-line toast and the button comes back.
• After adopt. The outside row leaves, and the managed idle session shows Drop in to <name>. After Interrupt and adopt, relay's recovery message carries the chip "Sent by relay after it took over".
• Feature map. New rows G6.107 and G6.108 (power door none) and a clause on G6.93. docs/api.md documents the route and the row fields.
• Journey. New journey outside-adopt covers the simple path. It launches the outside Claude as a person's terminal would: no agent entrypoint variables, and the prompt typed into the ready input box. It waits for the reply in the transcript.

Contract amendment 1 (in the issue): the route selftest is dropped, and its checks live in the Playwright spec through fakerelay.

Known, outside this PR

• Adopt refuses a terminal Claude that runs on relay's model broker: model_unknown relay#562: on a default stack, Claude Code runs on the broker's local model, and relay refuses Adopt as model_unknown. So outside-adopt FAILs there until relay fixes it. That matters for Close child: session adoption (eve) #598's verification run.
• Adopt refuses a terminal Claude as busy when an MCP server starts after its first reply relay#561: a terminal Claude started with a prompt argument is refused as busy (child_process) while its MCP server lives.
• Offer Interrupt and adopt after relay refuses Adopt as busy #605 (idea): offer Interrupt and adopt after a busy refusal.

Minor review notes (not fixed)

1. g6-outside-adopt.spec.js:337: the ended-row test's line check matches /can't be adopted/ only. The button check is sound, and the code keeps ended rows out twice.
2. g6-outside-adopt.spec.js:419: the busy-refusal toast check matches only the Can't adopt: prefix. The {"interrupt":false} body check holds.
3. docs/api.md:402: it says cos_list_sessions outside rows carry adoptable/adoptReason. Only cos_session_status does.
4. journeys-cos-outside.js:178: a missing input box ends as "did not reply", not as its own BLOCKED.
5. Theoretical: the journey's cleanup order could let relay's managed session rewrite the transcript after it is removed.

Fix attempts: T1 product 0. The outside-adopt journey took 3: launch env, a typed prompt, and the transcript reply wait. The third ran on the default model. Spec 1: the world shape. Tokens: about 1.2M across subagents.

Review: no blocking (round 1, default model; 5 minor in the notes above)
Journey: outside-adopt PASS on a stack at 5e0a04c with real Claude logged in (relay epic 2faa421); FAIL on the default broker stack with relay#562's model_unknown
Real-app check: outside-adopt on a real stack: one tap answered 201 with no claudeSessionId, the outside row left, Drop in showed under Idle, the pane's claude exited, relay audit holds session_adopt ok
Harness weakening: none (adds the outside-adopt journey and one frozen.json entry; other launches unchanged)
Main harness vs head: base harness (epic/596 at d2e6c64) against head 5e0a04c on a stack: outside-thread PASS; head harness: outside-thread PASS
Break-and-restore: removed r.item.adoptable === true from showsAdopt; 3 criterion-5 tests went red; restored, cmp identical

Suite: 865 passed, 0 failed (baseline 841); check:static and check:coverage ok.

🤖 Generated with Claude Code

[barelyworkingcode]

merge-check: merged. approved, target, contract, evidence, owner, weakening

[barelyworkingcode]

Merged: approved, target, contract, evidence, owner, weakening PASS; ci, verified NA.