Add Aspire and Playwright agent skills and refs

Signed-off-by: Tim Krampitz <Tim.Krampitz@live.com>

.agents/skills/playwright-cli/references/element-attributes.md

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+# Inspecting Element Attributes
+
+When the snapshot doesn't show an element's `id`, `class`, `data-*` attributes, or other DOM properties, use `eval` to inspect them.
+
+## Examples
+
+```bash
+playwright-cli snapshot
+# snapshot shows a button as e7 but doesn't reveal its id or data attributes
+
+# get the element's id
+playwright-cli eval "el => el.id" e7
+
+# get all CSS classes
+playwright-cli eval "el => el.className" e7
+
+# get a specific attribute
+playwright-cli eval "el => el.getAttribute('data-testid')" e7
+playwright-cli eval "el => el.getAttribute('aria-label')" e7
+
+# get a computed style property
+playwright-cli eval "el => getComputedStyle(el).display" e7
+```