Automatic component jobs need one reviewed source for path-to-board and
path-to-component decisions. Keeping that policy beside the existing
test buckets lets shared code classify changed tests consistently.
Add the six-board selection matrix and all board-specific,
cross-cutting, and explicit no-op paths. Validate the matrix while
loading the manifest.
Add a resolver for variable and label precedence, Git diffs, all-match
component unions, full collapse, empty reasons, and report output.
Exercise union routing, test classification, collapse, precedence,
stand-down reasons, defensive label errors, and six-board reporting
in an offline synthetic repository. Component coverage stays green.
Assisted-by: codex:gpt-5.6-sol
References: CI-9
Signed-off-by: Petr Štetiar <petr.stetiar@prplfoundation.org>
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