[eersnington]

Fixes the remaining part of #1989.

A guest fetch whose response body was never read kept the guest process alive (over 90 s, or forever on a keep-alive loopback server), and javascript.evaluate("(await fetch(url)).status") returned timed_out.

• Cause: the undici shim's finished() polled web stream state with setTimeout(poll, 0). An unread body never closes, so a ref'd timer re-armed about every millisecond. The socket and keep-alive pool accounting were already correct.
• finished() now subscribes to the stream's state transition instead of polling, so it holds no event-loop reference, like Node's eos. An in-flight request still keeps the process alive.

Guest script fetches a keep-alive server and does not read the body	main	This PR
Process exit	never (test timeout)	under 1 s

[railway-app]

This PR was not deployed automatically as @eersnington does not have access to the Railway project.

In order to get automatic PR deploys, please add @eersnington to your workspace on Railway.

[github-actions]

📟 Pip-Boy · adfc1cf

📦 Packages · fresh npm install resolve, no lockfile · this PR vs base

No notable install size, dependency, or entrypoint changes across 6 packages.

All 6 packages · linux-x64-gnu

package (linux-x64-gnu)	@latest	base	this PR	Δ vs base	packages
@rivet-dev/agentos-core	458.2 MB	325.9 MB	325.9 MB	0	10 (0)
@rivet-dev/agentos-node-pty	7.6 KB	18.0 KB	18.0 KB	0	1 (0)
@rivet-dev/agentos-posix	253.6 MB	253.6 MB	253.6 MB	0	7 (0)
@rivet-dev/agentos-runtime-core	253.6 MB	253.6 MB	253.6 MB	0	6 (0)
@rivet-dev/agentos-sandbox	495.5 MB	363.5 MB	363.5 MB	0	85 (0)
@rivet-dev/agentos-toolchain	130.8 KB	141.2 KB	141.2 KB	0	2 (0)

🧹 Rust dependencies

Skipped: this PR doesn't change any Rust code or dependencies.

🦀 Binaries

Skipped: this PR doesn't change any Rust code.

⏱ Timing

job	wall time	slowest step
changes	29s	checkout · 26s
zizmor	9s	checkout · 3s
footprint	1m30s	Pack this commit · 27s
⏭ self-test	—	skipped
⏭ native · ${{ matrix.platform }}	—	skipped
⏭ hygiene	—	skipped
report	20s	setup-node · 6s

🔭 Full CI trace for this commit

One OpenTelemetry trace of CI and Pip-Boy for adfc1cf: every job and step, with the sizes above attached. Run after CI finishes.

pnpm install --frozen-lockfile --filter 'pipboy...'
pnpm --filter pipboy pipboy trace --sha adfc1cfd57905c0e8ca86c6295b62a7bc742af9d

Add --otlp <url> to send it to any OTLP/HTTP collector.

Agent instruction: From a rivet-dev/agentos checkout, run the commands above, then read the trace file the last command prints. List the slowest jobs and steps and explain where CI time went.