fix: require reddit oauth source access

docs/sources/README.md

@@ -16,3 +16,4 @@ Source docs:
 - [Telegram](telegram.md)
 - [FIRMS](firms.md)
 - [Maritime](maritime.md)
+- [Reddit](reddit.md)

docs/sources/reddit.md

@@ -0,0 +1,33 @@
+# Reddit Source
+
+Reddit is used as a social sentiment input for selected geopolitical and market subreddits.
+
+## Configuration
+
+Create a Reddit script app at:
+
+```text
+https://www.reddit.com/prefs/apps/
+```
+
+Then set:
+
+```env
+REDDIT_CLIENT_ID=
+REDDIT_CLIENT_SECRET=
+```
+
+## Runtime Behavior
+
+- The source uses the OAuth client credentials flow and then reads `https://oauth.reddit.com`.
+- Unauthenticated `reddit.com/.../hot.json` scraping is intentionally disabled.
+- Missing credentials return `status: no_credentials` and are surfaced as source degradation.
+- OAuth failures return `status: auth_failed` without logging or returning the client secret.
+- Subreddit fetch failures return `status: degraded` with per-subreddit errors.
+
+## Test
+
+```bash
+node apis/sources/reddit.mjs
+npm run test:unit
+```