MASSIF Responsive Images

Ports the applicable improvements from our REDAXO sibling addon plus GitHub #1 (automatic image-format support detection), and stamps the fixes accumulated since v1.0.0.

Highlights

• Automatic image-format support detection (#1). AVIF/WebP <source> elements are only emitted when the active imaging driver can actually encode the format (probed via Statamic's ImageValidator), preventing broken images on drivers that lack a format — <picture> doesn't fall back from a broken source. Gating fails safe and is configurable via formats.detect_support.
• Sub-16px AVIF fix. AVIF variants below libavif's 16px floor (reachable at tall aspect ratios) are dropped — they otherwise produced 0-byte broken images.
• Dominant-color placeholder. The image's average color is painted under the LQIP, filling the box before bytes load (placeholder.color.enabled).
• sizes="auto" on lazy images (WHATWG auto-sizes, markup.auto_sizes).
• Opt-in EXIF/ICC metadata strip (strip_metadata, default off, Imagick-only).
• Min-width format threshold (formats.min_width, opt-in).
• Art-direction src inheritance — omit src to reuse the parent image with a different crop/focal per breakpoint.
• Debug "src not found" marker — surfaces unresolvable src in debug mode.

Also includes fixes accumulated since v1.0.0: multi-asset field source resolution, public-relative URL metadata reads, metadata-cache hardening (bounded TTL, failure sentinel), and tag_alias=null correctly disabling the {{ pic }} tag.

⚠️ Breaking changes since v1.0.0

• Default sizes flipped from '100vw' to a layout-aware default ('(min-width: 1280px) 640px, (min-width: 768px) 50vw, 90vw'). Republish the config and set 'default_sizes' => '100vw' to restore.
• cache.ttl removed → replaced by cache.metadata_ttl (90 days) and cache.sentinel_ttl (60s).
• Internal Pic class relocated to Massif\ResponsiveImages\Aliases\Pic.

New config keys (all backward-compatible via ?? default): formats.detect_support, formats.min_width, placeholder.color, markup.auto_sizes, strip_metadata.

Full details in CHANGELOG.md.

• N/A Changelog not available.