chore(skills): move data-explorer to Drop

AGENTS.md

@@ -230,7 +230,6 @@ How most packages work, so the bullets below don't repeat it:
   - `vp dlx skills add onmax/comark-ui` lists them beside comark-ui and installs the ones picked.
   - Each installs alone, so it carries the syntax of the blocks it uses in `references/blocks.md` and links nothing outside its folder. Its `references/example.md` is a finished document.
   - Each has a page in `docs/pages/skills/` that leads with that example rendered.
-- `skills/data-explorer` writes `report.json` instead of Comark: a shared template in `assets/` draws it as an interactive page, and `assets/page.html` is the one page: `scripts/build.mjs` checks `report.json`, fills the page's slots, inlines Vega when comark-ui is installed, and screenshots every tab, and an agent without Node fills the slots by hand. The page loads anything missing from jsDelivr, so `app.js` and `style.css` must keep working from `comark-ui/dist/skills/data-explorer/assets/` on npm. Its page links a live example on Drop instead of rendering one.
 
 ### Docs site
 

docs/pages/skills/index.md

@@ -14,7 +14,7 @@ tagline: Each skill teaches your agent one kind of document, what goes in it and
 - A visible change needs proof on a pull request: [Before/after evidence](/skills/before-after-evidence).
 - A review is done, and someone has to decide what to do: [Review document](/skills/review-document).
 - Someone has to choose between options or approve a plan, from your research: [Report](/skills/report).
-- Someone hands over data and wants to see what's in it, with graphs and filters: [Data explorer](/skills/data-explorer).
+- Someone hands over data and wants a dashboard with graphs and filters: Drop's [data-explorer skill](https://drop.vitehub.dev/.well-known/skills/data-explorer/SKILL.md?utm_source=comark-ui&utm_medium=skills), since it writes an HTML page rather than Comark.
 - Someone asked how a system, a flow, or a change works: [Visual explanation](/skills/visual-explanation).
 - Someone needs to learn one concept and prove it: [Teach lesson](/skills/teach-lesson).
 - Your agent needs a block's syntax, not a whole document: the [comark-ui skill](/guide/agents).

docs/pages/skills/report.md

@@ -29,7 +29,7 @@ Choose by what you have:
 - Options to compare, or a plan to approve: this skill.
 - Findings about code, a design, or a system that already exists: [Review document](/skills/review-document).
 - A question about how something works: [Visual explanation](/skills/visual-explanation).
-- Data you explore and filter yourself: [Data explorer](/skills/data-explorer).
+- Data you explore and filter yourself: Drop's [data-explorer skill](https://drop.vitehub.dev/.well-known/skills/data-explorer/SKILL.md?utm_source=comark-ui&utm_medium=skills).
 
 ## It's working if
 

skills/comark-ui/SKILL.md

@@ -53,7 +53,7 @@ Problems land in `meta.issues` after `parseMarkdown`, one sentence each, and a h
 
 ## Shape the document
 
-This skill teaches the blocks. Five sibling skills teach a whole document, what goes in it and in what order: `before-after-evidence`, `review-document`, `report`, `visual-explanation`, and `teach-lesson`. A sixth, `data-explorer`, builds an interactive data page from a `report.json` instead of Comark. When the user asks for one of those and it isn't installed, suggest `vp dlx skills add onmax/comark-ui` and picking it from the list.
+This skill teaches the blocks. Five sibling skills teach a whole document, what goes in it and in what order: `before-after-evidence`, `review-document`, `report`, `visual-explanation`, and `teach-lesson`. When the user asks for one of those and it isn't installed, suggest `vp dlx skills add onmax/comark-ui` and picking it from the list.
 
 ## Pick the blocks