Re-land Copilot composite support dropped by e0a0043 (#257) - #264
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Copilot's supportsSubAgents row was written against a CLI with no fan-out. 1.0.80 lists /fleet (parallel subagent execution), /tasks (subagents and shell commands) and /subagents, plus --agent on the launch line — the capability a composite leans on — so the row flips to true and the picker stops refusing the pairing. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Pxwzz1AZnVE3peZ8qMejLa
A composite never runs a session of its own; its workers do, and a worker created inside one with no backend named fell to NodeDraft.effectiveBackend — Claude Code. A composite labelled Copilot would have run Claude workers. Sub-graph creation now fills an unnamed backend from the composite (a findable creator still wins, a named backend wins over both), and the app's form seeds its picker with the open composite's backend the same way. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Pxwzz1AZnVE3peZ8qMejLa
…ts one Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Pxwzz1AZnVE3peZ8qMejLa
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Pxwzz1AZnVE3peZ8qMejLa
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Re-lands #257 (Copilot CLI hosts composite loops, and a composite's workers run on its backend), which merged to main as 081731c and was then undone wholesale by e0a0043 (#259, "one project, however its path is spelled"): that commit reverted every hunk of #257 alongside its own work, so 0.1.59-beta1 and 0.1.59 ship without it. The #253 fix from the same session survived.
The three commits are cherry-picked unchanged onto main at 2848f3e:
supportsSubAgents: true, read off Copilot 1.0.80's/fleet,/tasks,/subagents,--agent)runInSubGraph+ app form seeding)Verification: RESULTS
🤖 Generated with Claude Code
https://claude.ai/code/session_01Pxwzz1AZnVE3peZ8qMejLa