chore(ai): event schema validation tool + fixes

- Created `scripts/agent/validate-events.mjs` to validate event builders against schemas.
- Refactored `buildVideoPostEvent` in `js/nostrEventSchemas.js` to automatically generate the required `s` (storage pointer) tag if missing, using `infoHash`, `url`, or `videoRootId`.
- Verified that `js/utils/storagePointer.js` exists and is imported correctly.
- Updated `docs/nostr-event-schemas.md` to reflect the auto-generation behavior.
- Verified fixes with `scripts/agent/validate-events.mjs` and existing unit tests.

Co-authored-by: PR0M3TH3AN <[email protected]>

js/nostrEventSchemas.js

@@ -9,6 +9,10 @@ import {
   WATCH_HISTORY_LIST_IDENTIFIER,
   WATCH_HISTORY_VERSION_TAG_VALUE,
 } from "./config.js";
+import {
+  buildStoragePointerValue,
+  deriveStoragePointerFromUrl,
+} from "./utils/storagePointer.js";
 
 export const NOTE_TYPES = Object.freeze({
   VIDEO_POST: "videoPost",
@@ -889,6 +893,38 @@ export function buildVideoPostEvent(params) {
     tags.push(...sanitizedAdditionalTags.map((tag) => tag.slice()));
   }
 
+  const hasSTag = tags.some((t) => t[0] === "s");
+  if (!hasSTag) {
+    let contentObj = content;
+    if (typeof content === "string") {
+      try {
+        contentObj = JSON.parse(content);
+      } catch (e) {
+        contentObj = {};
+      }
+    }
+    contentObj = contentObj || {};
+
+    let pointer = "";
+    if (contentObj.infoHash) {
+      pointer = buildStoragePointerValue({
+        provider: "btih",
+        prefix: contentObj.infoHash,
+      });
+    } else if (contentObj.url) {
+      pointer = deriveStoragePointerFromUrl(contentObj.url);
+    }
+
+    if (!pointer && (dTagValue || contentObj.videoRootId)) {
+      const prefix = dTagValue || contentObj.videoRootId;
+      pointer = buildStoragePointerValue({ provider: "nostr", prefix });
+    }
+
+    if (pointer) {
+      tags.push(["s", pointer]);
+    }
+  }
+
   let serializedContent = "";
   if (typeof content === "string") {
     serializedContent = content;