Add CLI exit codes documentation to docs/cli.md

[himanshu231204]

Description

The CLI reference page (\docs/cli.md) doesn't document the exit codes that commands return. Having this documented helps users write scripts and CI/CD pipelines that check command results.

What to Add

Document the standard exit codes used across CLI commands:

• \

[AshSgDe29071999]

Working on this — documenting CLI exit codes in docs/cli.md.

[AshSgDe29071999]

Looks like docs/cli.md already documents the Exit codes table (0–5). Closing my claim so someone can pick a remaining gap if needed.