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-`start(request)` resolves the child's working directory, then performs `spawn` → ACP `initialize` → `newSession` before it fulfills. Fulfillment therefore means a remote session is ready and ownership has transferred to the caller. A spawn, initialization, new-session, or pre-publication cancellation failure ordinarily rejects after the subprocess is reaped; when cleanup itself rejects, ordered safe facts preserve startup plus teardown for an ordinary failure, or teardown alone after cancellation, without claiming process exit. A working-directory resolution failure rejects before anything is spawned. Non-cancellation rejections expose only fixed provider, stage, and category facts in their Error message; the original failure remains on the internal cause chain and in Host diagnostics.
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+`start(request)` resolves the child's working directory, then performs `spawn` → ACP `initialize` → `newSession` before it fulfills. Fulfillment therefore means a remote session is ready and ownership has transferred to the caller. A spawn, initialization, new-session, or pre-publication cancellation failure ordinarily rejects after the subprocess is reaped; when cleanup itself rejects, ordered safe facts preserve startup plus teardown for an ordinary failure, or teardown alone after cancellation, without claiming whole-tree quiescence. A working-directory resolution failure rejects before anything is spawned. Non-cancellation rejections expose only fixed provider, stage, and category facts in their Error message; the original failure remains on the internal cause chain and in Host diagnostics.
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The working directory is the configured `cwd` override when set, else the delegating parent session's cwd — never the server process's own cwd, because one server process serves sessions from many workspaces. The parent-derived value must be an absolute path naming a directory the harness can enter (search permission — what a subprocess cwd needs), and the same resolved path becomes both the subprocess cwd and the ACP `session/new` workspace.
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pku-xht