` sibling, finds the target by class name (works for bespoke forge-* blocks), injects a CSS scroll-driven animation, stamps data-pa-* for the page-animator panel, then hides itself."
+ },
+ {
+ "src": "blocks/animation/animation.css",
+ "dst": "blocks/animation/animation.css",
+ "purpose": "No-op stylesheet (the block hides itself in JS; animation CSS is generated per-animId)."
+ },
+ {
+ "src": "tools/page-animator/controls.js",
+ "dst": "tools/page-animator/controls.js",
+ "purpose": "Dependency of blocks/animation: the --pa-* param model + buildCssRule + generateAnimId (vendored from milo@page-animator-poc). Same vocabulary the page-animator panel reads/writes, so emitted animation sidecars are adjustable."
+ }
+ ],
+ "ignorePatches": [
+ {
+ "dst": ".eslintignore",
+ "lines": [
+ "scripts/*-animations.js"
+ ],
+ "purpose": "Per-template animation engines are vendored verbatim from the source."
+ },
+ {
+ "dst": ".stylelintignore",
+ "lines": [
+ "# Per-template CSS is vendor — extracted verbatim from the source.",
+ "# Ignore everything in styles/ except the repo's own boilerplate files.",
+ "styles/*.css",
+ "!styles/styles.css",
+ "!styles/lazy-styles.css"
+ ],
+ "purpose": "Skip per-template CSS files (vendored from source)."
+ }
+ ],
+ "gitignore": {
+ "dst": ".gitignore",
+ "lines": [
+ "# Snowflake skill: in-progress run state (committed only on close)",
+ ".snowflake/projects/*/state.json"
+ ],
+ "purpose": "Avoid churn from mid-run state.json writes; closed runs rename to state.json.closed and commit."
+ }
+}
diff --git a/plugins/aem/edge-delivery-services/skills/snowflake/assets/substrate-milo/VERSION b/plugins/aem/edge-delivery-services/skills/snowflake/assets/substrate-milo/VERSION
new file mode 100644
index 00000000..401faa83
--- /dev/null
+++ b/plugins/aem/edge-delivery-services/skills/snowflake/assets/substrate-milo/VERSION
@@ -0,0 +1 @@
+1.0.0-milo.3
diff --git a/plugins/aem/edge-delivery-services/skills/snowflake/assets/substrate-milo/animation-sidecars.md b/plugins/aem/edge-delivery-services/skills/snowflake/assets/substrate-milo/animation-sidecars.md
new file mode 100644
index 00000000..a299d7d1
--- /dev/null
+++ b/plugins/aem/edge-delivery-services/skills/snowflake/assets/substrate-milo/animation-sidecars.md
@@ -0,0 +1,72 @@
+# Animation sidecars — the `--pa-*` vocabulary (Milo block-level)
+
+Reference for Phase 3 step **B.5b** (Milo flavor, block-level). Scroll animations are
+authored as a sibling **`animation` block** inside a section, NOT as bundled JS. The
+vendored runtime — `blocks/animation/animation.js` + `tools/page-animator/controls.js`
+(shipped by the Milo substrate, from `milo @ page-animator-poc`) — reads the block's
+key/value rows, finds the target block by class name, and emits a CSS scroll-driven
+animation (`animation-timeline: view()`). The **page-animator panel** reads/writes the
+exact same keys, so anything emitted here is adjustable in the Animator and round-trips
+via the panel's "Copy to DA".
+
+## Block shape
+
+```html
+
+```
+
+- **Target:** the class after `animation` names the block in the same section
+ (`animation forge-hero`). Append an index for the Nth match of that class
+ (`animation forge-card 2`). **No class → animate the whole section.**
+- **Values are bare numbers** — the runtime does `parseFloat`, so write `24`, not `24px`.
+ Select-type keys take their string value (`entry 0%`). Emit only the keys you change;
+ omitted keys use the defaults below.
+- The block hides itself at runtime; it is pure config.
+
+## Keys and defaults
+
+Mirror of `tools/page-animator/controls.js` `CONTROLS` (the source of truth — keep this
+table in sync if that file changes).
+
+| Key | Type | Default | Notes |
+|---|---|---|---|
+| `--pa-opacity-from` | number 0–1 | `1` | start opacity (`0` = fade in) |
+| `--pa-translate-y` | number px | `0` | start Y offset (`24` = rise up) |
+| `--pa-translate-x` | number px | `0` | start X offset (±, slide in) |
+| `--pa-scale` | number | `1` | start scale (`1.05` / `0.95`) |
+| `--pa-blur` | number px | `0` | start blur (`8` = blur-in) |
+| `--pa-easing` | select | `cubic-bezier(0.42,0,0,1)` | `ease` \| `ease-in-out` \| `cubic-bezier(0.42,0,0,1)` \| `linear` |
+| `range-start` | select | `entry 0%` | scroll range start: `entry 0%` \| `entry 25%` \| `entry 50%` |
+| `range-end` | select | `entry 100%` | scroll range end: `entry 75%` \| `entry 100%` \| `cover 50%` |
+| `timing-opacity-start` | % | `0` | keyframe % where opacity begins moving |
+| `timing-opacity-end` | % | `100` | keyframe % where opacity finishes |
+| `timing-transform-start` | % | `0` | same for translate/scale |
+| `timing-transform-end` | % | `100` | same for translate/scale |
+| `timing-blur-start` | % | `0` | same for blur |
+| `timing-blur-end` | % | `100` | same for blur |
+
+The `from` values animate to their rest state (opacity→1, transform→none, blur→0) over
+the scroll `range`. The `timing-*` keys let each property move on a different slice of
+the range (e.g. opacity 0–40%, transform 0–100%).
+
+## Recipes
+
+- **Fade-up (default reveal):** `--pa-opacity-from 0`, `--pa-translate-y 24`,
+ `range-start entry 0%`, `range-end entry 60%`.
+- **Slide-from-left:** `--pa-opacity-from 0`, `--pa-translate-x -80`, `range-end entry 75%`.
+- **Blur-reveal:** `--pa-opacity-from 0`, `--pa-blur 12`, `range-end entry 60%`.
+- **Scale-in:** `--pa-opacity-from 0`, `--pa-scale 0.92`, `range-end entry 70%`.
+- **Stagger across sections:** keep the same params but step `range-start` later per
+ sibling section (`entry 0%`, `entry 10%`, `entry 20%`, …).
+
+## Notes
+
+- `animation-timeline: view()` requires Chrome 115+ / Safari 18+. No JS polyfill is
+ vendored. Acceptable for prototypes/demos.
+- Above-the-fold sections are already past their entry range at scroll 0, so they render
+ settled (no visible motion, no LCP cost). Emit them for consistency regardless.
+- Cinematics that don't reduce to these properties (Lenis/GSAP scrub, pinning) stay as
+ the bundled `scripts/
-animations.js` (page-level) — they are not adjustable.
diff --git a/plugins/aem/edge-delivery-services/skills/snowflake/assets/substrate-milo/blocks/animation/animation.css b/plugins/aem/edge-delivery-services/skills/snowflake/assets/substrate-milo/blocks/animation/animation.css
new file mode 100644
index 00000000..a73652f1
--- /dev/null
+++ b/plugins/aem/edge-delivery-services/skills/snowflake/assets/substrate-milo/blocks/animation/animation.css
@@ -0,0 +1,3 @@
+/* animation block — no additional styles needed.
+ * Vendored from milo @ origin/page-animator-poc (3fc472a1f) libs/c2/blocks/animation/animation.css
+ * The block hides itself in JS; all animation CSS is generated per-animId by buildCssRule. */
diff --git a/plugins/aem/edge-delivery-services/skills/snowflake/assets/substrate-milo/blocks/animation/animation.js b/plugins/aem/edge-delivery-services/skills/snowflake/assets/substrate-milo/blocks/animation/animation.js
new file mode 100644
index 00000000..82c828d9
--- /dev/null
+++ b/plugins/aem/edge-delivery-services/skills/snowflake/assets/substrate-milo/blocks/animation/animation.js
@@ -0,0 +1,86 @@
+/*
+ * animation — Milo scroll-driven animation sidecar block.
+ *
+ * VENDORED VERBATIM from Milo's page-animator work by Ryan:
+ * milo @ origin/page-animator-poc (3fc472a1f20a2c8da2aa7f2cba7847388222084b)
+ * libs/c2/blocks/animation/animation.js
+ *
+ * Authored as a sidecar block inside a section: ``
+ * with --pa-* / range-* / timing-* KV rows. Finds its target by class name /
+ * variant tokens (no allow-list, so it animates bespoke forge-* blocks too),
+ * compiles the rows to a CSS scroll-driven animation via buildCssRule, injects a
+ *