Summary

Create a shared exit code package for consistent error handling across both CLI tools.

Current State

• jtk has internal/exitcode/exitcode.go with well-defined exit codes
• cfl uses os.Exit(1) without structured exit codes

Proposed Changes

1. Move tools/jtk/internal/exitcode/ to shared/exitcode/
2. Update jtk imports to use shared package
3. Update cfl to use shared exit codes instead of hardcoded values

Exit Codes

const (
    Success         = 0
    GeneralError    = 1
    UsageError      = 2
    ConfigError     = 3
    APIError        = 4
    NotFoundError   = 5
    AuthError       = 6
)

Impact

Consistent exit codes enable better scripting and error handling for users of both tools.