Add star-player matches tab and watchlist-driven fetch.

Ship top-level #/matches with pro watchlist defaults, bump site to 0.5.71, and document the flow in AGENTS/README.

Co-authored-by: Cursor <cursoragent@cursor.com>

web/frontend/router.js

@@ -4,11 +4,13 @@
  * Hash-based router for the Climperor web site (web/relations).
  *
  * Synchronizes the browser URL with app state across these dimensions:
- *   - page: heroes | rankings | streamers | trends | mechanics | items | patches (top-level tab)
+ *   - page: heroes | rankings | matches | streamers | trends | mechanics | items | patches (top-level tab)
  *   - hero: selected hero key + detail sub-tab
  *     (skills|core|fears|trends|matchups|matches|streamers|patches; legacy stats → trends)
  *   - rankings: Immortal leaderboard region
  *     #/rankings[/region]  (legacy #/rankings/meta[/bracket] → players / china)
+ *   - matches: star-player recent matches (pro_matches)
+ *     #/matches[/account_id]
  *   - streamers: curated Douyin streamer directory
  *     #/streamers
  *   - trends: medal bracket for the 8-week win/pick board
@@ -30,7 +32,7 @@
  */
 
 const ROUTE_DEFAULT = "#/heroes";
-const VALID_PAGES = ["heroes", "rankings", "streamers", "trends", "mechanics", "items", "patches"];
+const VALID_PAGES = ["heroes", "rankings", "matches", "streamers", "trends", "mechanics", "items", "patches"];
 const VALID_DETAIL_TABS = [
   "skills",
   "core",
@@ -92,6 +94,7 @@ function parseHash(hash) {
     itemKey: null,
     patchVersion: null,
     rankingRegion: null,
+    matchesPlayerId: null,
     trendsBracket: null,
     trendsSort: null,
     mechanicEffect: null,
@@ -118,6 +121,10 @@ function parseHash(hash) {
     if (segs[1] && segs[1] !== "meta") {
       out.rankingRegion = safeDecode(segs[1]);
     }
+  } else if (page === "matches") {
+    if (segs[1] && /^\d+$/.test(segs[1])) {
+      out.matchesPlayerId = segs[1];
+    }
   } else if (page === "trends") {
     if (segs[1]) out.trendsBracket = safeDecode(segs[1]);
   } else if (page === "mechanics") {
@@ -175,6 +182,10 @@ function serializeHash(state) {
     if (region && region !== DEFAULT_RANKING_REGION) {
       hash += "/" + encodeURIComponent(region);
     }
+  } else if (state.page === "matches") {
+    if (state.matchesPlayerId) {
+      hash += "/" + encodeURIComponent(String(state.matchesPlayerId));
+    }
   } else if (state.page === "trends") {
     // Omit bracket when it is the default (legend) — bare #/trends means legend.
     const bracket = state.trendsBracket || DEFAULT_TRENDS_BRACKET;