Replace the direct use of `conversations::Context` with `client::ChatClient`,
which is the intended public API for library consumers.
Remove `MessageEnvelope` and the username-keyed session model. The envelope
was never part of the wire protocol — sender identity was only tracked in the
CLI's local state. Chats are now keyed by conversation ID; add `/nickname` as
the user-facing replacement for named sessions.
Add a logos-delivery (Waku) transport alongside the existing file transport.
The active transport is selected at compile time: set `LOGOS_DELIVERY_LIB_DIR`
to link liblogosdelivery, otherwise the file transport is used.
Add logos-delivery as a Nix flake input and expose `.#logos-delivery` so the
library can be built with `nix build` and referenced by `LOGOS_DELIVERY_LIB_DIR`.
CI: rename `c-ffi-smoketest` to `smoketest`; add logos-delivery build step
and a `--smoketest` invocation of chat-cli to verify startup.
* chore: remove ffi from double ratchet
* chore: format
* feat: chat cli demo app via file transport
* chore: fix the compile issues
* chore: fix long intro copy to clipboard
* chore: move chat cli to bin folder
* chore: use tmp data folder
* chore: update doc
* chore: use encrypted db with default db pass
* chore: fmt and clippy
* chore: fix clippy and refactor
* chore: utils for helper funcs
* chore: rename sessions to chats
