Track CLAUDE.md in-repo; fix stack doc (pgo -> kura)

.gitignore

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 _build/
 _checkouts/
 priv/attachments/*
-CLAUDE.md
 .claude/
 *.crashdump

CLAUDE.md

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+# chatli
+
+Erlang/OTP real-time chat backend built on the Nova web framework.
+
+## Stack
+- Erlang/OTP, Nova framework, Cowboy
+- PostgreSQL via kura (kura_postgres backend)
+- JWT auth via jwerl
+- Erlydtl templates
+- WebSocket for real-time delivery
+
+## Build & run
+```bash
+rebar3 compile
+rebar3 shell              # Dev with config/sys.config.local
+rebar3 release            # Production release
+```
+
+## Test & quality
+```bash
+rebar3 ct                 # Common Test
+rebar3 ci                 # compile, dialyzer, xref, fmt, lint
+rebar3 fmt                # erlfmt
+rebar3 lint               # rebar3_lint
+```
+
+## Configuration
+- Port: 8090 (nova.cowboy_configuration.port)
+- DB: PostgreSQL (host: db, port: 5432, user: postgres, pass: root)
+- WebSocket idle timeout: 15s
+- Attachments: ./priv/attachments/
+
+## API routes
+- `/v1/*` — public (signup, login, callbacks, history, heartbeat)
+- `/client/*` — JWT-protected (messages, chats, participants, devices)
+- `/client/device/:deviceid/user/:userid/ws` — WebSocket
+
+## Structure
+- `src/chatli_router.erl` — route definitions
+- `src/chatli_db.erl` — database queries
+- `src/chatli_auth.erl` — JWT auth
+- `src/chatli_ws_srv.erl` — WebSocket server
+- `src/chatli_ws_client.erl` — WebSocket client handler
+- `src/controllers/` — HTTP endpoint handlers
+- `src/plugins/` — Nova middleware