Add repo stats command

[kyle-rader]

Add repo stats subcommand to display repository statistics including commit author frequency, total commits, and project age.

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Note

Adds a repo stats CLI subcommand that reports total commits, project age, and commits per author.

• CLI:
  • Add Repo command with Stats subcommand in src/main.rs.
  • Route Cli::Repo { command: RepoSubcommand::Stats } to repo_stats().
• Logic:
  • Implement repo_stats() to aggregate commit authors, compute total commits, determine first commit timestamp/date, and print stats.
  • Add format_duration() helper to format elapsed time.

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[cursor]

Bug: Time Displays Silently Drop Seconds

The condition parts.len() < 3 prevents seconds from being displayed when there are exactly 3 other time components (e.g., years, days, hours), causing data loss. For example, a duration of 1 year + 2 days + 3 hours + 30 seconds would display as "1y 2d 3h", silently dropping the 30 seconds. The condition should likely be parts.len() < 4 to allow up to 4 total components including seconds.