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docs: define a seam as the (Service, Service provider, Consumer) trio

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2026-07-20 14:45:32 +08:00
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docs/subsystems/subprocess.md
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@@ -242,7 +242,7 @@ interface SubprocessOutcome {
`spawnTerminal(spec)` is the non-pipe process primitive. The provider allocates the controlling terminal and owns UTF-8 text transport, foreground-process-group inspection and signalling, and one awaited TERM-to-KILL operation that reaches quiescence for every session member the provider can still observe; providers document substrate-specific observability limits. The PTY backend remains responsible for prompt detection, readiness inference, scrollback, sandbox policy, and persistent-session ownership; ordinary `spawn()` cannot reconstruct controlling-terminal semantics.
The terminal spec fully specifies argv, cwd, environment overrides, dimensions, cleanup grace, and optional allocation cancellation. Its handle exposes `pid`, ordered output, `done`, `write`, `inspectForeground`, `signalForeground`, and awaited `terminate`; the exact public shapes are generated into the [`ctx.subprocess` service catalog](#ctxsubprocess--subprocessservice-abstract-seam).
The terminal spec fully specifies argv, cwd, environment overrides, dimensions, cleanup grace, and optional allocation cancellation. Its handle exposes `pid`, ordered output, `done`, `write`, `inspectForeground`, `signalForeground`, and awaited `terminate`; the exact public shapes are generated into the [`ctx.subprocess` service catalog](#ctxsubprocess--subprocessservice).
## Service behavior
@@ -273,9 +273,9 @@ async getSandbox(): Promise<Sandbox>
Source: [`packages/e2b/e2b/src/index.ts:74`](../../packages/e2b/e2b/src/index.ts)
<a id="ctxsubprocess--subprocessservice-abstract-seam"></a>
<a id="ctxsubprocess--subprocessservice"></a>
### `ctx.subprocess` — `SubprocessService` (abstract seam)
### `ctx.subprocess` — `SubprocessService`
Abstract subprocess service. Subclass, implement spawn, and load the subclass as a plugin — it registers as `ctx.subprocess` (one implementation per context; loading a second throws, which is cordis' standard duplicate-service behavior).