docs: update README/AGENTS for current codebase state

- README: added --host flag, toolchain check commands, docker output fix
- AGENTS: documented --host bind address behavior, macOS bcopy fix,
  check-toolchain scripts, updated architecture tree

README.md

@@ -15,9 +15,16 @@ mise install      # installs go 1.26, node 22
 mise run build    # → ./fetch
 ```
 
+### Toolchain check
+```bash
+mise run check-all              # checks gcc, brew, mise, go, node, docker, colima
+mise run check-toolchain        # core tools only
+mise run check-docker-toolchain # docker + compose + colima (macOS)
+```
+
 ### Docker
 ```bash
-docker compose up --build
+mise run docker-up
 # Open http://localhost:8080
 ```
 
@@ -27,9 +34,13 @@ docker compose up --build
 mise run build
 ./fetch search --filter vocal
 
-# Web server
+# Web server (local)
 mise run serve
-# Open http://localhost:8080
+# Open http://localhost:PORT (auto-assigned)
+
+# Web server (Docker / network-accessible)
+./fetch serve --host 0.0.0.0 -p 8080
+# Open http://<host-ip>:8080
 
 # Electron (macOS)
 mise run electron-deps
@@ -61,18 +72,22 @@ electron/               Electron wrapper (spawns fetch serve as sidecar)
   ├── preload.js        context bridge
   └── package.json      electron-builder config
 
+scripts/
+  ├── extract_wavs.sh       batch WAV extraction via akaiutil
+  ├── check-toolchain.sh    verify gcc, brew, mise, go, node
+  └── check-docker-toolchain.sh  verify docker, compose, colima
+
 third_party/akaiutil/   Vendored akaiutil 4.6.7 (C, GPLv2)
-scripts/extract_wavs.sh Bash wrapper for batch WAV extraction
 ```
 
 ## Tech Stack
 
 | Component   | Tech               | External Deps |
 |-------------|--------------------|---------------|
-| CLI server  | Go 1.26, stdlib    | 0             |
-| Web UI      | HTML/CSS/JS (vanilla) | 0          |
+| CLI server  | Go 1.26, stdlib    | 0 |
+| Web UI      | HTML/CSS/JS (vanilla) | 0 |
 | Electron    | Electron 33, electron-builder | Node deps |
-| Extraction  | akaiutil (C), bash | vendored      |
+| Extraction  | akaiutil (C), bash | vendored C source |
 
 Zero Go dependencies. The web UI uses no framework — vanilla JS, Web Audio API, Server-Sent Events.
 
@@ -84,6 +99,7 @@ See [open issues](https://git.notsosm.art/david/akai-utils/issues).
 |---|---------|--------|
 | — | Search, download, extract, pipeline (CLI) | done |
 | — | HTTP server + web UI + Electron shell | done |
+| — | Docker compose + mise toolchain + toolchain checks | done |
 | #1 | Disk Browser — browse AKAI filesystem in web UI | todo |
 | #2 | Disk Inspector — detailed disk metadata | todo |
 | #3 | WAV→Disk Packager — create AKAI ISOs from WAVs | todo |