feat: add nested phase spans for OpenTelemetry tracing #323
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Description
Add individual spans for each build phase (prep, pull, lint, test, build, package) as children of package spans. This enables detailed timeline visualization in tracing backends to identify which phases are slow.
Introduces
PhaseAwareReporteras an optional interface to avoid breaking existing reporters.Related Issue(s)
Continues work from #298 (CLC-2107)
How to test
leeway.build→leeway.package→leeway.phase