site.yaml can now declare excludes: [paths/patterns] that are passed to
`aws s3 sync` and `aws s3 cp` as --exclude flags, so the listed objects
are neither uploaded from the build dir nor deleted from the bucket.
Escape hatch for assets managed out-of-band (e.g. large PDFs uploaded
via aws-cli) that would otherwise be wiped by --delete.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Donavan Fritz
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