feat: execute Tessera UI source with embedded Aster

examples/README.md

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+# Endor UI examples
+
+[hello.endor](hello.endor) returns a native UI tree using an ordinary helper
+function and `main`. It covers text, a rounded rectangle, row/column layout and
+spacing. Submit it as the UTF-8 body of a namespace PUT request; no namespace,
+scene, render block or imports belong in the source.
+
+The live `/agent` guide embeds this exact example. Remote CI executes it through
+Aster and checks the resulting coordinates and source ranges after VM cleanup.
+The file is client-side sample material; Tessera's API stores source by namespace.
+
+Return to the [project guide](../README.md).

examples/hello.endor

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+function heading(value: Text): View {
+    return ui.text(value, 2, "#242422")
+}
+
+function main(): View {
+    let title = heading("Hello Endor")
+    let rectangle = ui.rect(240, 80, 12, "#DCE8FF")
+    let detail = ui.row(0, 12, ui.text("Aster VM"), ui.spacer(8), ui.text("Tessera UI"))
+    return ui.column(24, 12, title, rectangle, detail)
+}