Expand a needs-dependent matrix through the new jobparser.ExpandMatrixWithNeeds,
which evaluates the raw matrix against the needs context via NewInterpeter the
same way EvaluateConcurrency does. This replaces synthesizing a workflow with
stub jobs and re-parsing it once the dependencies complete.
Parse now emits a single placeholder per needs-dependent matrix and the whole
matrix expands exactly once when the needs finish, instead of being split per
static value at planning time and re-expanded per placeholder. This removes
ExtractRawStrategies, HasMatrixWithNeeds and constructWorkflowWithNeeds.
Side effects of deferring the whole matrix: a static+dynamic matrix no longer
duplicates N times, needs-output detection no longer relies on string matching
(so bracket notation is handled), and a deferred placeholder gets no commit
status until it expands, avoiding an orphaned status from the name change.
Co-Authored-By: Claude (Opus 4.8) <noreply@anthropic.com>
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