[chrisbbreuer]

Summary

Let finite native commands follow an HTTP request's cancellation signal. runBoundedProcess now accepts an optional native AbortSignal, refuses an already-canceled launch, and terminates and settles the owned child/readers before rejecting a later cancellation. The reason stays in cause without coercion, listeners are removed after settlement, and the first failure retains precedence.

request cancellation
  -> terminate owned process scope
  -> settle child and both readers
  -> reject with controlled message and original cause

The broader CLI checks also exposed an independent output-test launch problem: project preloads added env diagnostics to exact-output streams. Those fixtures now use their private cwd/config and a minimal OS environment. Real payloads, pipes, assertions, compiled autoload settings and timing guards remain intact.

Refs #2988 and #2989. This is a prerequisite for Open Farming's authenticated planning adapter; it does not implement that adapter or its ownership decisions.

Evidence

• Before: three genuine missing-cancellation failures. An already-canceled call still launched, and live producers waited for their normal deadline. Separately, the unchanged broad CLI suite reported three output cases contaminated by project env warnings.
• After: final native Buddy focused runs pass all 23 process cases and all 8 source/compiled output cases. Tests observe real PIDs, pending pipes/exit, an exited parent with an inherited-pipe descendant, listener removal, invalid admission, a registration race and opaque reasons. Existing limits, strict UTF8 and nonzero results remain covered.
• The complete CLI package suite passed 109 tests with 213 assertions after fixture isolation. Its repeat was stopped before launch by the fresh 4 GB disk guard after later fixture typing cleanup. Exact candidate CI remains the final broad gate; the blocked repeat is not a pass.
• Native frozen install preserves the lock. Full framework typecheck, CLI declaration checks, targeted strict fixture types, package build and 438-page docs build pass. A copied built module works outside the checkout with preloads and package auto-install disabled. Lint passes with six existing utility-class warnings in unrelated views. Independent Spec and Standards reviews are clean.
• The buffered first-cause counterfactual probe passed and is not presented as an established prior decoder/cancellation regression.

Merge Danger

Door: Two-way.

Blast Radius: CLI.

The option is additive. Existing omitted-signal limits and result shape remain intact. Invalid supplied signals now reject before launch; cancellation rejects with <label> canceled. POSIX cleanup covers the owned process group; Windows covers the direct child/readers. Escaped descendants and hostile-code containment are outside the contract. Native source release and actual public consumer qualification remain separate acceptance gates.

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commit: 9423413