docs: sync all markdown with current architecture
Remove session management concepts (no create_session/close_session/
DELETE /sessions — Master handles container lifecycle automatically).
Update PlatformClient contract, ChatContext, project structure tree,
and FSM diagrams across all docs to match the implemented core/.
- README.md: fix core/ structure tree + PlatformClient snippet
- docs/surface-protocol.md: remove session.py/_template.py, fix
ChatContext (drop session_id), fix PlatformClient contract, fix
"free features" list
- docs/telegram-prototype.md: remove "создаёт сессию на платформе"
- docs/matrix-prototype.md: same + remove !sessions, fix FSM
(SessionCreated → ChatCreated), fix status block
- docs/user-flow.md: rewrite sequence diagram to POST /users/{id}/
chats/{id}/messages; update FSM states
Mikhail Putilovskij
4f5c5679d5