docs(reference): cover bare dice and tilde fences

Add the bare d-form (d20) to the dice notation table, and note that role fences accept backticks or tildes with hyphen-capable attribute keys. Regenerate both reference copies from known.ts and mirror the notes in the skill and markdown docs.

.agents/skills/tttk-authoring/reference.md

@@ -256,6 +256,10 @@ Renders a clickable span that dispatches a journal command.
 The `role=` attribute on the info string determines how a fenced block is
 handled.
 
+Fences may use backticks or tildes (`~~~`); the closing fence must reuse
+the opening marker. Fence attribute keys may contain hyphens (e.g.
+`data-foo=bar`).
+
 ### `role=spark-table`
 
 CSV (or markdown pipe table) rendered as `:md-table`.
@@ -339,6 +343,7 @@ Used by `:md-dice`, spark-table headers, and the journal `/roll`:
 |---|---|
 | `2d6` | two six-sided dice |
 | `1d20+5` | d20 plus modifier |
+| `d20` | one twenty-sided die (count optional) |
 | `3d6kh1` | keep highest 1 |
 | `3d6dl2-1` | drop lowest 2, minus 1 |
 | `{d4, d8}` | choose one of the listed dice |