feat: add Sprites integration for cloud-based Claude execution

[bborn]

Summary

Add Sprites (Fly.io managed sandboxes) as an execution environment for Claude tasks. Sprites provide isolated VMs where Claude can run with --dangerously-skip-permissions safely.

Architecture: Sprite as execution environment only

┌─────────────────────┐              ┌─────────────────────┐
│   Local Machine     │              │       Sprite        │
│                     │              │                     │
│  ┌───────────────┐  │              │  ┌───────────────┐  │
│  │   task TUI    │  │              │  │    Claude     │  │
│  │   + daemon    │  │   executes   │  │  (isolated)   │  │
│  │   + database  │──┼──────────────▶  │               │  │
│  └───────────────┘  │              │  └───────┬───────┘  │
│         ▲           │              │          │          │
│         │           │   tail -f    │          ▼          │
│         └───────────┼──────────────┼── /tmp/task-hooks   │
│                     │   (hooks)    │                     │
└─────────────────────┘              └─────────────────────┘

Key changes:

• Task app runs locally - database, TUI, daemon all stay on your machine
• When SPRITES_TOKEN is set, Claude executes on sprite instead of local tmux
• Hooks stream back via file tailing (/tmp/task-hooks.jsonl)
• No database syncing needed - sprite is just a sandbox

New files:

• internal/sprites/sprites.go - Shared token/client logic
• internal/executor/executor_sprite.go - SpriteRunner + hook streaming
• cmd/task/sprite.go - CLI commands for sprite management

Usage:

# Set token (once)
export SPRITES_TOKEN=<your-token>
# or: task sprite token <your-token>

# Run task normally - Claude now executes on sprite
task

# Manual sprite management
task sprite status   # Show sprite status
task sprite up       # Start/restore sprite
task sprite down     # Checkpoint and suspend
task sprite attach   # Interactive shell on sprite
task sprite destroy  # Delete sprite

Test plan

• Set SPRITES_TOKEN and verify Claude runs on sprite
• Verify hooks update task status in real-time
• Test task sprite subcommands
• Verify local execution still works without token

🤖 Generated with Claude Code