[chubes4]

Closes #3665

Summary

Implemented and committed as 97e9eabb. All 25 standalone media tests, four required smokes, and scoped lint passed.

What changed

• Added machine-readable DPI to print presets.
• Applied preset resolution when saving PNG and JPEG images.
• Added validated ability dpi and CLI --dpi overrides.
• Added standalone tests for resolution metadata, defaults, overrides, and invalid inputs.

Compatibility

Non-print behavior, pixel dimensions, version strings, and CHANGELOG remain unchanged.

Verification

Gate gate-1 passed on b3ec767, base main at 1af0b24.

Gate command and provenance

set -e
[ -f vendor/autoload.php ] || composer install -q --no-interaction --no-progress
git fetch -q origin main || true
homeboy review lint data-machine --path "$PWD" --changed-since origin/main
EXT=$(homeboy extension show wordpress | grep -m1 '"path"' | sed -E 's/.*"path": "([^"]+)".*/\1/')
PU="$EXT/vendor/bin/phpunit"
for t in tests/Unit/Abilities/Media/*Test.php; do grep -q WP_UnitTestCase "$t" && continue; echo "== $t"; php "$PU" --bootstrap vendor/autoload.php "$t"; done
for f in tests/poster-template-smoke.php tests/abilities-image-template-load-order-smoke.php tests/image-template-file-urls-smoke.php tests/lightweight-ability-manifest-smoke.php tests/abilities-categories-load-order-smoke.php tests/abilities-send-email-load-order-smoke.php; do php "$f" >/dev/null || { echo "FAIL $f"; exit 1; }; done
echo "gate ok"

• gate-1: commit b3ec767da686766291acbcfc9f8905ac615d7b7d, tree 608820663bedad86cbaa4e320ae43e562003e32f, fingerprint 2fec898efc4e7ec8caf30bbbdc374a2ad98af0abbad6626e5ba66c212b25d65b

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AI disclosure: cook-heavy via Homeboy (pi). Used for: Producing print images with intended physical-size metadata.