Add Agent Canvas skins marketplace listing

skins/README.md

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+# Agent Canvas Skins Marketplace
+
+`marketplace.json` is the curated list of installable **Agent Canvas
+skins**. A skin is a GitHub repo in the skin format (see the skins
+support in [OpenHands/OpenHands](https://github.com/OpenHands/OpenHands)):
+
+```
+skin.yaml        # name, screenshot, canvas_version, theme, secret NAMES, mcp_servers, skills, llm, settings
+package.json     # "start" script; the app listens on $OPENHANDS_SKIN_PORT
+automations/     # optional exported automations (definition + code)
+```
+
+The Canvas host reverse-proxies `/skin/*` to the app **verbatim** and also
+serves the skin at `/` (the instance's front page). The app must serve its
+UI at `/skin/` (index.html with `<base href="/skin/">` + static assets)
+and its own backend endpoints at `/skin/api/*` on `$OPENHANDS_SKIN_PORT`.
+
+**Theming:** a skin declares its major colors once in `skin.yaml` under
+`theme:` (hex values; keys: `accent`, `background`, `surface`, `text`,
+`muted`, `border`, `success`, `warning`, `danger`). While the skin is
+installed the Canvas host derives its **entire UI palette** from these —
+the whole app rethemes, not just the skin tab — and serves the derived
+CSS variables back at `GET /skin-api/theme.css` for the skin app to link
+(after its own styles, with standalone fallbacks). One palette in the
+manifest, inherited on both sides.
+
+The [Agent Canvas Manager](https://github.com/OpenHands/app-acm) renders
+this list as its marketplace: pick a skin when creating an instance and
+the new instance boots with that skin installed. Skin repos may be
+**private** — consumers read them (and the screenshots) with a GitHub
+token.
+
+## Listing requirements
+
+- `repo` — GitHub repository URL of the skin.
+- `screenshot` — image of the skin populated with **sample data only**
+  (never end-user data), usually `docs/screenshot.svg` in the skin repo.
+- `canvas_version` — the Agent Canvas version range the skin supports.
+- No secret values anywhere; skins declare secret **names** in their
+  `skin.yaml` and installers supply values during guided setup.

skins/marketplace.json

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+{
+  "name": "agent-canvas-skins",
+  "description": "Marketplace of Agent Canvas skins — git-backed packages that reconfigure an Agent Canvas instance and serve a purpose-built web app as its default tab. Consumed by the Agent Canvas Manager (OpenHands/app-acm). Skin repos may be private; readers authenticate with a GitHub token.",
+  "skins": [
+    {
+      "name": "Agent Canvas Manager",
+      "repo": "https://github.com/OpenHands/app-acm",
+      "description": "Control plane for provisioning and governing a fleet of Agent Canvas instances in Kubernetes, plus this marketplace.",
+      "screenshot": "https://raw.githubusercontent.com/OpenHands/app-acm/main/docs/screenshot.svg",
+      "canvas_version": ">=1.8.0"
+    },
+    {
+      "name": "Datadog Monitor",
+      "repo": "https://github.com/OpenHands/skin-datadog-monitor",
+      "description": "Datadog monitor dashboard with agent-assisted alert investigation. Needs DATADOG_TOKEN (+ optional DATADOG_APP_KEY).",
+      "screenshot": "https://raw.githubusercontent.com/OpenHands/skin-datadog-monitor/main/docs/screenshot.svg",
+      "canvas_version": ">=1.8.0"
+    },
+    {
+      "name": "Linear Admin",
+      "repo": "https://github.com/OpenHands/skin-linear-admin",
+      "description": "Linear triage/admin dashboard with agent-assisted issue handling. Needs LINEAR_API_KEY.",
+      "screenshot": "https://raw.githubusercontent.com/OpenHands/skin-linear-admin/main/docs/screenshot.svg",
+      "canvas_version": ">=1.8.0"
+    }
+  ]
+}