update Markdown skills

skill-examples/board-position-card.md

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+---
+id: board-position-card
+name: Board (per position)
+description: Control test — the same Board card, rendered inside every position card.
+pages:
+  - positions
+status: active
+ui:
+  type: card
+  placement: grid-card
+  title: Board
+  source: position.activity
+  periods:
+    - today
+    - last-7-days
+    - previous-month
+---
+
+# Board (per position)
+
+## Purpose
+
+The position-aware control for the page-level Board card. `grid-card` resolves to
+`after-position-card`, which renders inside each position card and supplies that
+position as context — so `position.activity` reads and the card is drawn once per
+role rather than once for the page.
+
+## Capabilities
+
+- Summarize activity for the position the card belongs to.
+- Show that activity across today, the last 7 days and the previous month.