Initial workspace scaffold

Cargo workspace with 5 crates: buh-entity (pure data structs),
buh-data (Turso/libsql data access), buh-util (scraper, rules,
processor, sync modules), buh-cli (binary "buh" with client/daemon
subcommands), and buh-ws (axum WebSocket server).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

CLAUDE.md

@@ -0,0 +1,53 @@
+# CLAUDE.md
+
+This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
+
+## What is buh
+
+buh is a media automation engine that scrapes torrent indexers, indexes torrents and metadata, selects downloads via operator-defined ingestion/discard rules, queues downloads, processes downloaded files (renaming), and syncs them to LAN targets (e.g., Jellyfin media folders). Media types: shows, movies, music, books, audio-books.
+
+## Build & Test Commands
+
+```bash
+cargo check --workspace          # fast type-check all crates
+cargo build --workspace          # full build
+cargo test --workspace           # run all tests
+cargo test -p buh-entity         # test a single crate
+cargo run -p buh-cli -- --help   # run the CLI
+cargo run -p buh-cli -- daemon --config daemon.toml  # run daemon mode
+cargo run -p buh-ws              # start the WebSocket server
+```
+
+The CLI binary is named `buh` (not `buh-cli`). When no subcommand is given, it defaults to `client` mode.
+
+## Architecture
+
+Cargo workspace with edition 2024, resolver 3. All shared dependencies are declared in the root `Cargo.toml` under `[workspace.dependencies]` and inherited by crates.
+
+### Dependency graph (arrows = "depends on")
+
+```
+buh-entity          ← leaf crate, no internal deps, serde-only
+    ↑
+buh-data            ← Turso/libsql data access layer
+    ↑
+buh-util            ← domain logic (scraper, rules, processor, sync modules)
+    ↑
+buh-cli, buh-ws     ← binaries
+```
+
+### Crate responsibilities
+
+- **buh-entity** — Pure data structs. No business logic, no database awareness. Only depends on `serde`. Every other crate imports this.
+- **buh-data** — All database access goes through `Db` struct wrapping a libsql `Connection`. Uses `thiserror` for typed errors. Schema migrations live in `Db::migrate()`.
+- **buh-util** — Domain logic organized as modules: `scraper` (indexer scraping), `rules` (ingestion/discard evaluation), `processor` (file renaming), `sync` (LAN file sync).
+- **buh-cli** — Binary `buh` with two clap subcommands: `client` (default, interactive) and `daemon` (reads TOML config, runs routines). Config path defaults to `/etc/buh/daemon.toml`.
+- **buh-ws** — Axum-based WebSocket server on port 9000, endpoint `/ws`.
+
+### Error handling convention
+
+Libraries (`buh-data`, `buh-util`, `buh-entity`) use `thiserror` for typed errors. Binaries (`buh-cli`, `buh-ws`) use `anyhow` for error erasure.
+
+### Config format
+
+Daemon configuration is TOML. The schema is defined in `buh-entity::config`. See `daemon.toml` at the repo root for an example.