Add wiki submissions pipeline + season photo on REBUILT page

- Added slater-chesapeake-2026 photo to games/2026-rebuilt page
- submissions_state.json tracks processed Discord messages
- Photo pipeline tested end-to-end: Discord -> download -> optimize -> wiki -> Quartz

submissions_state.json

@@ -0,0 +1,16 @@
+{
+  "last_processed_id": "1504314756339597333",
+  "processed_ids": [
+    "1504311623328727210",
+    "1504311826098290829",
+    "1504312518712234084",
+    "1504312317297426493",
+    "1504312172212129874",
+    "1504312091895402607",
+    "1504312059888926731",
+    "1504312141635649587",
+    "1504312900234383416",
+    "1504313397854863512",
+    "1504314756339597333"
+  ]
+}