Add local in-memory pubsub

docs/roadmap.md

@@ -228,11 +228,16 @@ authorization and durable-state boundaries clear.
   - `[ ]` Prefix-scoped capabilities can allow or deny writes.
   - `[ ]` KV metadata is replicated through Iroh Documents.
 
-- `[ ]` Iroh-gossip pubsub integration.
+- `[~]` Iroh-gossip pubsub integration.
   Acceptance criteria:
-  - `geth pubsub pub/sub` works for local test nodes.
-  - Pubsub messages are lossy notifications, not durable facts.
-  - Docs and tests keep durable state in CAS/KV/document/db instead.
+  - `[x]` `geth pubsub pub/sub` works against the local daemon.
+  - `[x]` Local pubsub messages are kept in a bounded daemon-lifetime ring
+    buffer.
+  - `[x]` Pubsub messages are documented and tested as lossy notifications, not
+    durable facts.
+  - `[ ]` `geth pubsub pub/sub` works across local test nodes over Iroh.
+  - `[ ]` Pubsub publish/subscribe access is capability checked.
+  - `[ ]` Docs and tests keep durable state in CAS/KV/document/db instead.
 
 ## Phase 4: Pipes, SSH Proxy, And SSH Distribution