fix(e2e): kill dev server trees and stop teardown hook timeouts

[wyattjoh]

Summary

Two teardown bugs have been failing E2E runs on main. Cleanup hooks ran on bun's 5s default timeout while each test-user delete shells out to a cold bun src/cli.ts and hits BAPI, which regularly takes longer than that with eight files running in parallel — so a test that had already passed got failed by its own cleanup. Cleanup hooks now get a 60s timeout, and users-list deletes its users concurrently.

That flake then became a guaranteed failure because killDevServer signalled only the spawned npx wrapper. npm forwards SIGTERM and exits, so the harness logged "dev server stopped" while the real dev server was reparented to init, still holding its port and dev lockfile; the retry reused the same project dir and died with "Another dev server is already running". killDevServer now snapshots the full process tree before signalling — descendants become unreachable from proc.pid once the wrapper exits — SIGTERMs it, and escalates to SIGKILL for anything that outlasts the grace period, comparing command lines to guard against pid reuse. Tree liveness replaces proc.exited as the stopping condition, which also fixes a hang when an orphan holds the inherited stdio pipes.

Test plan

• format:check, lint, typecheck, test (2618 pass, 0 fail)
• Orphan reproduced against a SIGTERM-ignoring grandchild; the new code kills it and frees the port, and the happy path stays fast (114ms)
• nextjs-pages-router + users-list against the live API: 5 pass, 0 fail, no dev-server processes left behind
• Full E2E suite in CI

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Latest commit: 409619e

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Run ID: 4b1b0d4b-9683-45fa-90a2-bce46cd20b9a

📥 Commits

Reviewing files that changed from the base of the PR and between 5a58b22 and 409619e.

📒 Files selected for processing (3)

• test/e2e/lib/dev-server.ts
• test/e2e/lib/fixture-test.ts
• test/e2e/users-list.test.ts

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📝 Walkthrough

Walkthrough

The end-to-end development-server cleanup now discovers and terminates the full process tree, escalates from SIGTERM to SIGKILL, and waits for cleanup on early exits. Fixture cleanup hooks use 60-second timeouts. Users-list teardown deletes tracked users concurrently before removing temporary configuration.

Estimated code review effort: 4 (Complex) | ~45 minutes

Suggested reviewers: rafa-thayto

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