test(server): ACP teardown tests pass on Windows hosts

[sheehanmunim]

Fixes #17011

Problem

Two AcpAdapterV2 teardown tests fake processGroupPlatform: "win32" but still depend on the real host platform, so both fail when the suite runs on a Windows host.

• "Windows teardown is one-shot explicitly with independent finalizer cleanup" fails with expected 2 to equal 1. The scope finalizer is meant to be independent of the cached explicit teardown. It picks its kill method from HostProcessPlatform, so on a Windows host it calls the stubbed taskkill a second time. On Linux it sends SIGKILL instead, and the count stays 1.
• "poisons the session when hard teardown defects and blocks replacement work" depends on the mock agent's bash -c 'sleep 120 & …' fixture writing host PIDs. On Windows:
  • With Git Bash first on PATH, $$/$! are MSYS PIDs (for example 41199 is Windows PID 17276), so process.kill(pid, 0) never sees them. The test fails with declared failed-teardown Bash and sleep PIDs must both become live.
  • With WSL's bash.exe first on PATH (the default from PowerShell, where sleep is not found), the PID file is never written and the test hangs until it times out. Each failed run also left an orphaned acp-mock-agent.ts node process.

Change

Test-only, along the lines suggested in the #17011 triage:

• Test 1: the final assertion expects the finalizer's extra taskkill only on a Windows host, and checks that it repeats the same command. On Linux the assertion is unchanged.
• Test 2: adds the Linux-host guard (if ((yield* HostProcessPlatform) !== "linux") return;) that this file already uses for its other real-process fixture tests.

Scope and approval

#17011 is a triaged issue. This takes the test-only fixes proposed there and touches only AcpAdapterV2.test.ts.

Verification

On Windows 11 (Node 25, pnpm 11.10.0), from apps/server:

• Before:
  • Test 1 failed with expected 2 to equal 1.
  • Test 2 failed after 7.75s from Git Bash (… PIDs must both become live), and hung until the 120s timeout from PowerShell.
• After: vp test run src/orchestration-v2/Adapters/AcpAdapterV2.test.ts -t "Windows teardown is one-shot|poisons the session when hard teardown" gives 2 passed, with no orphaned processes.
• vp fmt --check is clean. vp lint reports only existing warnings on lines this diff doesn't touch, and the server typecheck passes.
• Not run on Linux. The changes leave Linux behavior as it was: test 1 asserts the same count there, and test 2 still runs there.

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[macroscopeapp]

Approvability

Verdict: Approved at da71433

Macroscope's review found this PR approvable — This is a small, self-contained test-only portability fix confined to an ignored test path. Its changes affect test assertions and platform-specific fixture execution, with no production runtime or product-default impact.

Notes:

• No code objects were reviewed. Approvability was decided on eligibility alone.

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• apps/server/src/orchestration-v2/Adapters/AcpAdapterV2.test.ts

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📝 Walkthrough

Walkthrough

The teardown tests now account for host-platform differences. The Windows test checks the finalizer’s taskkill invocation. The hard-teardown-defect test runs only on Linux.

Changes

Teardown test updates

Layer / File(s)	Summary
Platform-specific teardown assertions apps/server/src/orchestration-v2/Adapters/AcpAdapterV2.test.ts	The Windows teardown test checks the finalizer’s taskkill command against the explicit termination command. The hard-teardown-defect test returns early on non-Linux hosts.

Priority: ➖ Normal

Estimated code review effort: 1 (Trivial) | ~5 minutes

Change: Other · Severity of issue fixed: Medium

Suggested reviewers: juliusmarminge

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Merge Risk: 🔵 Low · up to da714

On non-Linux hosts, this test appears to pass without exercising hard-teardown behavior, which can mislead test results. The impact is limited to test reporting; runtime teardown is unchanged.

Architecture Summary

Architecture risk: 🔵 Low · up to da714

The change affects 1 system.

Changed systems: apps/server

Architecture concerns
No architecture-level concerns identified.

Review details

Systems and components

• observed — apps/server (service) was modified; 1 changed file maps to changed impact.

Before / after behavior

• observed — Modified behavior in apps/server/src/orchestration-v2/Adapters/AcpAdapterV2.test.ts: The teardown test now expects the finalizer’s kill path to depend on the host platform: one total taskkill call on non-Windows hosts and two on Windows, with the final command matching the first. Previously, it expected exactly one call in every case.
• observed — Modified behavior in apps/server/src/orchestration-v2/Adapters/AcpAdapterV2.test.ts: The hard-teardown-defect test now returns early on non-Linux hosts; previously, it had no platform guard.

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Pre-merge checks | 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check		The title clearly and concisely describes the test-only change that makes ACP teardown tests pass on Windows hosts.
Description check		The description includes the problem, affected tests, change details, linked issue and scope justification, focused verification results, limitations, and tooling information. It is complete and align…
Linked Issues check		Active issue #17011 identifies two Windows failures in AcpAdapterV2.test.ts. The reported diff changes the finalizer assertion to expect the host-dependent second taskkill only on Windows and to v…
Out of Scope Changes check		The reported diff changes only apps/server/src/orchestration-v2/Adapters/AcpAdapterV2.test.ts. The six added lines and one removed line apply to the two tests named by issue #17011. No runtime teard…

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Actionable comments posted: 1

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Inline comments:
Review comments at
@apps/server/src/orchestration-v2/Adapters/AcpAdapterV2.test.ts:
- Line 12440: Update the platform-specific live test around HostProcessPlatform
to use it.live.skipIf with HostProcess.Platform.defaultValue() so non-Linux
platforms report the test as skipped rather than passed; remove the early return
while preserving the test assertions.

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