Phase 1 of tracer bullet: Slinging Handoff
- Add internal/wisp package for ephemeral work attachment
- Add gt sling command to attach work and restart
- Update gt prime to check/burn slung work on hook
- Add .beads-wisp/ to gitignore
- cmd/gt/main.go: Entry point using Cobra
- internal/cmd/root.go: Root command with description
- internal/cmd/version.go: Version command with build info
- internal/style/style.go: Lipgloss styles for terminal output
Closes gt-u1j.1
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>