fix(webperf-core-web-vitals): consistent Subparts naming

Rename LCP-SubParts.js → LCP-Subparts.js, update internal script
identifier ("LCP-Sub-Parts" → "LCP-Subparts"), rename calcSubParts →
calcSubparts, and fix all remaining LCP-Sub-Parts references in SKILL.md

Author: nucliweb

skills/webperf-core-web-vitals/SKILL.md

@@ -12,7 +12,7 @@ JavaScript snippets for measuring web performance in Chrome DevTools. Execute wi
 
 - `scripts/CLS.js` — Cumulative Layout Shift (CLS)
 - `scripts/INP.js` — Interaction to Next Paint (INP)
-- `scripts/LCP-Sub-Parts.js` — LCP Sub-Parts
+- `scripts/LCP-Subparts.js` — LCP Subparts
 - `scripts/LCP-Trail.js` — LCP Trail
 - `scripts/LCP-Video-Candidate.js` — LCP Video Candidate
 - `scripts/LCP.js` — Largest Contentful Paint (LCP)
@@ -23,7 +23,7 @@ Descriptions, thresholds, and return schemas: `references/snippets.md`, `referen
 
 Scripts fall into two execution patterns:
 
-### Synchronous (LCP, CLS, LCP-Sub-Parts, LCP-Trail, LCP-Video-Candidate)
+### Synchronous (LCP, CLS, LCP-Subparts, LCP-Trail, LCP-Video-Candidate)
 
 Run via `evaluate_script` and return structured JSON immediately from buffered performance data. The page must have already loaded.
 
@@ -97,7 +97,7 @@ Use this decision tree to automatically run follow-up snippets based on results:
 
 ### After LCP.js
 
-- **If LCP > 2.5s** → Run **LCP-Sub-Parts.js** to diagnose which phase is slow
+- **If LCP > 2.5s** → Run **LCP-Subparts.js** to diagnose which phase is slow
 - **If LCP > 4.0s (poor)** → Run full LCP deep dive workflow
 - **If LCP candidate is a video** → Run **LCP-Video-Candidate.js**
 - **Always run** → **LCP-Trail.js** to understand candidate evolution
@@ -136,7 +136,7 @@ Use this decision tree to automatically run follow-up snippets based on results:
 
 When a script returns `status: "error"`:
 
-- **LCP/CLS/LCP-Sub-Parts/LCP-Trail** → The page may not have finished loading. Ask the user to wait for full load or reload, then re-run the script.
+- **LCP/CLS/LCP-Subparts/LCP-Trail** → The page may not have finished loading. Ask the user to wait for full load or reload, then re-run the script.
 - **INP** (`getINP()` returns error) → No interactions have been recorded yet. Remind the user to interact with the page, then call `getINP()` again.
 - **LCP-Video-Candidate** → No LCP entries found; see LCP error recovery above.
 
@@ -149,4 +149,4 @@ window.__cwvHighlight = false;
 // then run any LCP script
 ```
 
-Scripts that support this flag: `LCP.js`, `LCP-Sub-Parts.js`, `LCP-Trail.js`.
+Scripts that support this flag: `LCP.js`, `LCP-Subparts.js`, `LCP-Trail.js`.

…-core-web-vitals/scripts/LCP-SubParts.js …-core-web-vitals/scripts/LCP-Subparts.jsskills/webperf-core-web-vitals/scripts/LCP-SubParts.js renamed to skills/webperf-core-web-vitals/scripts/LCP-Subparts.js skills/webperf-core-web-vitals/scripts/LCP-SubParts.js renamed to skills/webperf-core-web-vitals/scripts/LCP-Subparts.js

@@ -19,7 +19,7 @@
     return null;
   };
 
-  const calcSubParts = (lcpEntry, navEntry) => {
+  const calcSubparts = (lcpEntry, navEntry) => {
     const lcpResEntry = performance
       .getEntriesByType("resource")
       .find((e) => e.name === lcpEntry.url);
@@ -44,7 +44,7 @@
     const navEntry = getNavigationEntry();
     if (!navEntry) return;
 
-    const { ttfb, lcpRequestStart, lcpResponseEnd, total } = calcSubParts(lcpEntry, navEntry);
+    const { ttfb, lcpRequestStart, lcpResponseEnd, total } = calcSubparts(lcpEntry, navEntry);
 
     if (HIGHLIGHT && lcpEntry.element) {
       lcpEntry.element.style.outline = "3px dashed lime";
@@ -72,14 +72,14 @@
   // Synchronous return for agent (buffered entries)
   const lcpEntry = performance.getEntriesByType("largest-contentful-paint").at(-1);
   if (!lcpEntry) {
-    return { script: "LCP-Sub-Parts", status: "error", error: "No LCP entries yet" };
+    return { script: "LCP-Subparts", status: "error", error: "No LCP entries yet" };
   }
   const navEntry = getNavigationEntry();
   if (!navEntry) {
-    return { script: "LCP-Sub-Parts", status: "error", error: "No navigation entry" };
+    return { script: "LCP-Subparts", status: "error", error: "No navigation entry" };
   }
 
-  const { ttfb, lcpRequestStart, lcpResponseEnd, total } = calcSubParts(lcpEntry, navEntry);
+  const { ttfb, lcpRequestStart, lcpResponseEnd, total } = calcSubparts(lcpEntry, navEntry);
   const totalMs = Math.round(total);
   const ttfbVal = Math.round(ttfb);
   const loadDelayVal = Math.round(lcpRequestStart - ttfb);
@@ -105,7 +105,7 @@
   }
 
   return {
-    script: "LCP-Sub-Parts",
+    script: "LCP-Subparts",
     status: "ok",
     metric: "LCP",
     value: totalMs,