feat(sync): seamless conversation sync, git-like version control, and offline remote notification

README.md

@@ -3,6 +3,9 @@
 Remote control for [DeepSeek Harness](https://github.com/deepseek-ai/deepseek-harness), in the style of Claude Desktop: one **master** and any number of **slaves**.
 
 - **Every session on every device.** Sessions run on the machine that created them. From any device you can browse all of them, open them, and chat in them; the work still executes on the owning machine.
+- **Seamless conversation sync & continuation.** Continue any remote conversation directly on the current instance (or any other available device). The conversation history and events are smoothly synced locally so it behaves as if created natively on the current machine.
+- **Git-like version control & conflict detection.** Tracks branch sequence points (`baseSeq`), commits (`versionToken`), and divergence. If a session is modified across multiple instances or continued while an instance was offline, conflicts are flagged immediately to prevent sync anomalies.
+- **Offline remote notification ASAP.** If a session is moved or continued to another instance while the original host is offline, move notices are securely queued and transmitted the instant the offline device reconnects, safely updating state and preventing split-brain edits.
 - **The full remote UI at `/r/<device>/`.** The whole DSH UI of another device is proxied over the link: HTTP, the Remote WebSocket, SSE, plugin bundles and terminals. Slave→slave goes through the master's relay.
 - **Plugin and config sync, master → slaves.** Slaves get the master's npm/registry bundles, its local `link:` plugins (packed and shipped over the link) and its `cordis.patch.yml`. The config lands in a *managed* bundle layer, so each slave's own `cordis.patch.yml` still wins and slave-only plugins stay untouched.
 - **Opt-in secrets.** A credential (`OMNI_API_KEY`, …) reaches a slave only if three places agree: the master offers it, the master enables it for that device, and the slave accepts it.