docs: Bonfire guest local feed — outbox republish notes

Document why /@foss had posts while /feed/local was empty, and SQL to
publish outbox activities into Local users + public internet feeds.

configs/bonfire/README.md

@@ -10,3 +10,5 @@
 | FEDERATE (2026-07-10) | `2026/2026-07-10--bonfire-federate.md` |
 
 Secrets: `koopa-admin-secrets/…/koopa-bonfire/{.env,users.env}`.
+
+Public timelines: `public-feeds.md`.

configs/bonfire/public-feeds.md

@@ -0,0 +1,36 @@
+# Bonfire public timelines (guest)
+
+## Symptom
+
+Profile `@foss` shows posts, but `/` and `/public` can look empty
+(“That’s all for the last 30 days…”). **Local feed** should list instance posts.
+
+## Root cause (2026-07-10)
+
+Posts were only in the author **outbox** feed, not in:
+
+| Feed | Pointer UUID |
+|------|----------------|
+| Local users | `797632fc-029e-06f0-1031-410d73a5558e` |
+| Anyone on the internet | `0aab414c-eb0a-ac1d-8c81-ef0d74ec55da` |
+
+Outbox feed (example foss): `019f487a-df20-4ed0-a334-40ec3eac23e7`.
+
+## Fix applied
+
+SQL: copy all `bonfire_data_social_feed_publish` rows from the user outbox
+into the two public feeds (see `scripts/bonfire/publish-outbox-to-public.sql`).
+
+## Verify
+
+```bash
+curl -sS http://127.0.0.1:9021/feed/local | grep -c gitbot
+# or open https://bonfire.hacktivism.ch/feed/local
+# profile: https://bonfire.hacktivism.ch/@foss
+```
+
+Note: Guest **Front page** (`/`) may still emphasise Spotlight (empty until pins).
+Prefer **Local** (`/feed/local`) for the public instance timeline.
+
+`FEDERATE=true` in env; UI may still show “Federation disabled” if app
+`activity_pub` instance `federating` was false until runtime refresh.