Retries and Timeouts

## flaky-integration

```meta
retries = 3          # up to 4 attempts in total
retry_delay = "2s"   # default: 1s
timeout = "5m"       # per attempt; exit code 124 when exceeded
```

```bash
./run-integration-tests.sh
```

• Durations accept ms, s, m, h; a bare number is seconds.
• Only runtime failures are retried. Missing runtimes or parameters fail immediately.
• A task with timeout runs in its own process group so the whole tree is stopped. It therefore cannot read from the terminal.