feat(storage): storage backend by URL; session stores on tinystoragedrivers; bump tinyagents + tinyflows

AGENTS.md

@@ -19,7 +19,7 @@ Architecture: [overview](gitbooks/developing/architecture.md),
 | `crates/openhuman-core/src/core/` | CLI, controller contract (`Outcome`, schemas) and in-process dispatch, controller registry, event bus, runtime composition; no business logic and no JSON-RPC server |
 | `crates/openhuman-cli/` | The `openhuman-core` binary (`src/main.rs`), the developer/benchmark bins (`src/bin/`), and every root `tests/*.rs` / `examples/*.rs` target; depends on `openhuman-tinyhumans` for the backend transport the core does not carry |
 | `crates/openhuman-embed/` | Typed library facade for embedding the core in another product |
-| `crates/openhuman-rpc/` | JSON-RPC 2.0 over the core: envelopes, HTTP client, and the server (router, Socket.IO, listener, `run_server*`) used by app, CLI and TUI; plus `session_store` (`session-store` feature), the on-disk session store (`session_raw/`, `session_db/`, `tinyagents_store/`, turn states) behind TinyAgents' session store port, which the app, CLI and TUI install. Core and embed reach session state through the port (`agent::session_store`); a few legacy paths still fall back to workspace files when no store is installed |
+| `crates/openhuman-rpc/` | JSON-RPC 2.0 over the core: envelopes, HTTP client, and the server (router, Socket.IO, listener, `run_server*`) used by app, CLI and TUI; plus `session_store` (`session-store` feature), the on-disk session store (`session_raw/`, `session_db/`, `tinyagents_store/`, turn states) behind TinyAgents' session store port, which the app, CLI and TUI install. Core and embed reach session state through the port (`agent::session_store`); a few legacy paths still fall back to workspace files when no store is installed. With a storage URL (`OPENHUMAN_STORAGE_URL` / `[storage] url`), `install_for_host` installs TinyAgents' `DriverSessionStores` over that backend instead (core `storage` domain) |
 | `crates/openhuman-tinyhumans/` | The TinyHumans layer above embed: SDK-backed backend transport, a `RuntimeBuilder` that boots connected, and the host-side login/session owner (login-token exchange, `/auth/me`, current-user cache, credential handoff) used by app and TUI |
 | `crates/openhuman-tui/` | Standalone terminal frontend |
 | `tests/` | Rust integration and JSON-RPC tests |