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.

scripts/bonfire/README.md

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+# Bonfire host helpers
+
+Live: `/home/hernani/koopa-bonfire/`.
+
+| File | Role |
+|------|------|
+| `publish-outbox-to-public.sql` | Copy outbox activities into Local users + Anyone on the internet feeds |
+
+```bash
+podman exec -i koopa-bonfire-db psql -U postgres -d bonfire_db \
+  < scripts/bonfire/publish-outbox-to-public.sql
+```
+
+See `configs/bonfire/public-feeds.md`.

scripts/bonfire/publish-outbox-to-public.sql

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+-- Republish activities from a user outbox feed into guest-visible public feeds.
+-- Default outbox = foss (adjust OUTBOX_FEED if needed).
+-- Run:
+--   podman exec -i koopa-bonfire-db psql -U postgres -d bonfire_db < publish-outbox-to-public.sql
+
+\set OUTBOX_FEED '019f487a-df20-4ed0-a334-40ec3eac23e7'
+\set FEED_INTERNET '0aab414c-eb0a-ac1d-8c81-ef0d74ec55da'
+\set FEED_LOCAL_USERS '797632fc-029e-06f0-1031-410d73a5558e'
+
+INSERT INTO bonfire_data_social_feed_publish (id, feed_id)
+SELECT fp.id, :'FEED_INTERNET'::uuid
+FROM bonfire_data_social_feed_publish fp
+WHERE fp.feed_id = :'OUTBOX_FEED'::uuid
+ON CONFLICT DO NOTHING;
+
+INSERT INTO bonfire_data_social_feed_publish (id, feed_id)
+SELECT fp.id, :'FEED_LOCAL_USERS'::uuid
+FROM bonfire_data_social_feed_publish fp
+WHERE fp.feed_id = :'OUTBOX_FEED'::uuid
+ON CONFLICT DO NOTHING;
+
+SELECT n.name, count(*)
+FROM bonfire_data_social_feed_publish fp
+LEFT JOIN bonfire_data_social_named n ON n.id = fp.feed_id
+GROUP BY 1
+ORDER BY 2 DESC
+LIMIT 15;