AI Implementation feature(910): Scoreboard: Ranking, Matrix, Event Log and Score Graph 1.00 (#53)

docs/guides/scoreboard-page.md

@@ -3,7 +3,7 @@ type: guide
 title: Scoreboard Page
 description: How a signed-in player navigates /scoreboard, uses the four tabs (Ranking, Matrix, Event Log, Score Graph), and watches live solve updates arriving over the authenticated SSE stream.
 tags: [guide, scoreboard, sse, live, ranking, matrix, event-log, score-graph, tester]
-timestamp: 2026-07-23T05:10:00Z
+timestamp: 2026-07-23T05:41:00Z
 ---
 
 # Overview
@@ -157,7 +157,12 @@ The same `solve` frame that lights up the
   New players are appended to the matrix row list.
 * **Event Log**: a new `EventLogRow` is prepended to the list
   (deduplicated by `solveId` so reconnects don't duplicate) and the
-  list is capped at 200.
+  list is capped at 200. The SSE solve frame carries
+  `challenge_name` / `category_abbreviation` (sourced from the same
+  `challenge` + `category` join that backs the
+  `/api/v1/scoreboard/event-log` REST projection), so the prepended
+  row's category abbreviation and challenge name are populated
+  immediately — no refresh is required.
 * **Score Graph**: the matching player's series receives a new
   `{tUtc: awardedAtUtc, value: prevValue + awardedPoints}` point,
   the series list is re-sorted by final value DESC and trimmed to the