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* Exclude perf baselines from parallel CI via --skip; sample hung tests Every app-suite CI run since the perf baselines landed (#1335) has timed out at the 15-minute job limit — main has been red for five consecutive runs. The job logs show the PerformanceBaselineTests fixtures dispatched into the parallel phase despite the BITCHAT_SKIP_PERF_BASELINES env guard from #1336, followed by ~11 minutes of silence until the timeout kills swiftpm-testing. The suite passes locally in seconds with identical flags, so the hang is specific to the CI toolchain/runners — consistent with the known XCTest-measure-under-parallel-workers hang the serial step was created to avoid. Two changes: - Exclude the baselines from the parallel phase with --skip at the SPM level, which removes them from the worker processes entirely instead of relying on the env guard reaching setUpWithError. They still run (and gate) in the dedicated serial step. - Wrap the parallel run in a 10-minute watchdog that samples any still-running test processes before killing them, so if anything else ever hangs, the run fails fast with thread stacks in the log instead of a silent 15-minute timeout. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> * Arm the test-hang watchdog only for the test execution phase Codex review: swift test builds before running, so the watchdog timer included dependency resolution and compilation — a cold-cache coverage build on a slow runner could be killed before tests ever started. Build the tests in their own step (bounded by the 15-minute job timeout like any build) and run the watchdog around swift test --skip-build, tightened to 5 minutes now that it times only test execution. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> * Hammer transport thread-safety tests from the dispatch pool, not the cooperative pool The watchdog added in this PR captured the actual CI hang twice, with identical stacks both times: NostrTransportTests' 100-task groups park every Swift Concurrency cooperative thread in a blocking queue.sync (the pool has one thread per core — 3 on CI runners, 10+ on dev machines, which is why this never reproduced locally). Blocking the entire cooperative pool violates the forward-progress contract, and the runners' dispatch wedges under the resulting asyncAndWait flood — taking concurrently running tests down with it (the panic-reset test deadlocked in a serviceQueue barrier that never got scheduled). Run the same 100 concurrent hammer iterations via DispatchQueue.concurrentPerform from a single global-queue hop instead: identical thread-safety coverage, executed on dispatch worker threads where blocking is legal, zero cooperative threads parked. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> --------- Co-authored-by: jack <jackjackbits@users.noreply.github.com> Co-authored-by: Claude Fable 5 <noreply@anthropic.com>