fix(lolschedule): structured error logging for cargoquery failures

Swaps the best-effort console.warn for JSON log lines emitted via
console.log so Workers Observability + wrangler tail surface the real
cause (HTTP status, API error info, or non-JSON body) when /lol_today
and /lol_week fall into the error branch.

src/modules/lolschedule/api-client.js

@@ -51,10 +51,35 @@ async function cargoQuery(params) {
     body,
     cf: { cacheTtl: 30, cacheEverything: true },
   });
-  if (!res.ok) throw new Error(`Leaguepedia API HTTP ${res.status}`);
-  const json = await res.json();
-  if (json?.error) throw new Error(`Leaguepedia error: ${json.error.info || json.error.code}`);
-  return (json?.cargoquery || []).map((r) => r.title);
+  const text = await res.text();
+  if (!res.ok) {
+    console.log(
+      JSON.stringify({ msg: "lolschedule_fetch", status: res.status, body: text.slice(0, 500) }),
+    );
+    throw new Error(`Leaguepedia API HTTP ${res.status}`);
+  }
+  let json;
+  try {
+    json = JSON.parse(text);
+  } catch {
+    console.log(
+      JSON.stringify({ msg: "lolschedule_parse_fail", body: text.slice(0, 500) }),
+    );
+    throw new Error("Leaguepedia non-JSON response");
+  }
+  if (json?.error) {
+    console.log(
+      JSON.stringify({
+        msg: "lolschedule_api_error",
+        code: json.error.code,
+        info: json.error.info,
+      }),
+    );
+    throw new Error(`Leaguepedia error: ${json.error.info || json.error.code}`);
+  }
+  const rows = (json?.cargoquery || []).map((r) => r.title);
+  console.log(JSON.stringify({ msg: "lolschedule_fetch_ok", rows: rows.length }));
+  return rows;
 }
 
 /** Format a JS Date as Leaguepedia's UTC literal: `YYYY-MM-DD HH:MM:SS`. */

src/modules/lolschedule/handlers.js

@@ -41,7 +41,9 @@ export async function handleToday(ctx, db) {
     const rows = await getCachedMatches(db, from, to, CACHE_TTL_TODAY_SEC);
     await ctx.reply(renderToday(rows, from), { parse_mode: "HTML" });
   } catch (err) {
-    console.warn("lolschedule /lol_today failed", String(err));
+    console.log(
+      JSON.stringify({ msg: "lolschedule_today_fail", err: String(err) }),
+    );
     await ctx.reply("Could not fetch today's matches. Try again later.");
   }
 }
@@ -61,7 +63,9 @@ export async function handleWeek(ctx, db) {
     const rows = await getCachedMatches(db, from, to, CACHE_TTL_WEEK_SEC);
     await ctx.reply(renderWeek(rows, from, to), { parse_mode: "HTML" });
   } catch (err) {
-    console.warn("lolschedule /lol_week failed", String(err));
+    console.log(
+      JSON.stringify({ msg: "lolschedule_week_fail", err: String(err) }),
+    );
     await ctx.reply("Could not fetch this week's matches. Try again later.");
   }
 }