feat: lake: empty build detection & --allow-empty#13500
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Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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This PR adds a check for empty
lake buildinvocations (as an empty build usually indicates a misconfiguration). Builds with no jobs will now print "Nothing to build." and invocations oflake buildwith no default targets configured will produce a warning. This will be promoted to an error in the future. The warning (and future error) can be suppressed with the new--allow-emptyCLI option.