Summary

Constants duplicated across multiple files.

Current State

Duplicated constants:

• OAuth scopes in 3 files (gmail, calendar, contacts clients)
• File permissions scattered:
  • 0755 for directories
  • 0644 for files
  • 0600 for tokens
  • 0700 for config dirs
• Config directory name "google-readonly" in 4 files

Problems

1. Changing a permission requires finding all occurrences
2. Risk of inconsistent values
3. Magic numbers reduce code readability

Proposed Solution

Create internal/constants or add to internal/config:

const (
    // Directory permissions
    ConfigDirPerm  = 0700
    OutputDirPerm  = 0755
    
    // File permissions
    TokenFilePerm  = 0600
    OutputFilePerm = 0644
    
    // OAuth scopes
    GmailScope    = gmail.GmailReadonlyScope
    CalendarScope = calendar.CalendarReadonlyScope
    ContactsScope = people.ContactsReadonlyScope
)

Priority

P3 - Code organization