feat: init command, README, fix config creation, move cicd

- cmd_init.go: interactive setup wizard (gosleep-timer init)
- README.md: comprehensive documentation
- config/config.go: fix os.IsNotExist → errors.Is for wrapped err
- main.go: remove '(no TUI)' from run help
- cicd.yaml moved to .github/workflows/cicd.yaml

README.md

@@ -0,0 +1,200 @@
+# ⏱ gosleep-timer
+
+TUI sleep timer with modular WM/DE support. Go rewrite of `timer.py`.
+
+## Quick start
+
+```bash
+# Run TUI
+gosleep-timer
+
+# First time? Interactive setup wizard
+gosleep-timer init
+```
+
+## Installation
+
+```bash
+go install github.com/forust/gosleep-timer@latest
+# or
+git clone https://github.com/forust/gosleep-timer
+cd gosleep-timer
+go build -o gosleep-timer .
+sudo cp gosleep-timer /usr/local/bin/
+```
+
+## Usage
+
+### TUI mode (default)
+
+```bash
+gosleep-timer
+```
+
+Keys:
+| Key | Action |
+|-----|--------|
+| `s` | Start timer |
+| `S` | Stop timer |
+| `Tab` | Next field |
+| `↑`/`↓` | Previous/next profile |
+| `1`-`0` | Toggle modules |
+| `h` | History |
+| `?` | Help |
+| `q`/`Esc` | Quit |
+
+### CLI mode
+
+```bash
+# Run with defaults (25m)
+gosleep-timer run
+
+# Custom duration
+gosleep-timer run 45m
+gosleep-timer run 1h30m
+
+# With profile
+gosleep-timer run 20m --profile work
+```
+
+### Other commands
+
+```bash
+# Interactive setup
+gosleep-timer init
+
+# List profiles
+gosleep-timer list-profiles
+
+# Export/import config
+gosleep-timer export > config-backup.yaml
+gosleep-timer import < config-backup.yaml
+
+# History and stats
+gosleep-timer history
+gosleep-timer stats
+```
+
+## Configuration
+
+File: `~/.config/gosleep-timer/config.yaml`
+
+### Profiles
+
+```yaml
+profiles:
+  default:
+    modules:
+      workspace:
+        enabled: true
+        backend: auto        # auto, niri, hyprland, kde
+        workspace: 12
+      media:
+        enabled: true
+        action: stop         # stop, pause, play-pause, next, previous
+      lock:
+        enabled: true
+        command: ""          # custom command or auto-detect
+      kill:
+        enabled: false
+        processes: [firefox, telegram-desktop]
+      notify:
+        enabled: true
+        sound: ""            # path or empty
+      sound:
+        enabled: true
+        file: /usr/share/sounds/freedesktop/stereo/complete.oga
+      brightness:
+        enabled: false
+        value: 0
+      mute:
+        enabled: false
+      custom:
+        enabled: false
+        pre: []
+        post: []
+      script:
+        enabled: false
+        path: ""
+
+  work:
+    extends: default
+    modules:
+      workspace:
+        workspace: 5
+```
+
+### Profile inheritance
+
+Profiles can extend others. Modules from the base profile are merged and overlaid.
+
+## Modules
+
+| Module | Stage | Description |
+|--------|-------|-------------|
+| **workspace** | pre | Switch WM workspace (niri/Hyprland/KDE) |
+| **media** | pre | Control music player via playerctl |
+| **lock** | post | Lock screen |
+| **kill** | pre | Kill processes by name |
+| **notify** | post | Desktop notification |
+| **sound** | post | Play audio file |
+| **brightness** | pre/post | Dim/restore brightness |
+| **mute** | pre/post | Mute/unmute audio |
+| **custom** | pre/post | User-defined shell commands |
+| **script** | pre/post | Run external script with args |
+
+### Workspace backends
+
+| Backend | Command |
+|---------|---------|
+| niri | `niri msg action focus-workspace {n}` |
+| Hyprland | `hyprctl dispatch workspace {n}` |
+| KDE | `qdbus org.kde.KWin /KWin setCurrentDesktop {n}` |
+
+Auto-detection checks `$XDG_CURRENT_DESKTOP`, then tries `hyprctl` and `niri msg`.
+
+## Project structure
+
+```
+gosleep-timer/
+├── main.go                 # CLI entrypoint
+├── cmd_init.go             # Interactive setup wizard
+├── config/                 # YAML config load/save/types
+├── engine/                 # Timer core, executor, stages
+├── modules/                # Module interface + 10 implementations
+├── profiles/               # Profile manager
+├── history/                # JSONL log + statistics
+├── tui/                    # Bubbletea TUI app
+├── cicd.yaml               # CI/CD pipeline
+└── Dockerfile              # Multi-stage build
+```
+
+## Development
+
+```bash
+# Build
+go build -o gosleep-timer .
+
+# Test
+go test ./...
+
+# Lint
+golangci-lint run --config .golangci.yml
+
+# Static analysis
+staticcheck ./...
+gosec ./...
+revive -config .revive.toml ./...
+```
+
+## CI/CD
+
+Pipeline (`.github/workflows/cicd.yaml`):
+- **lint-go**: golangci-lint, staticcheck, gosec, revive
+- **lint-yaml**: yamllint
+- **build**: go build + test with race detector
+- **publish**: Docker image to registry (main/dev branches)
+
+## License
+
+MIT