[cli-consistency] Missing documentation for `campaign validate` subcommand

[github-actions]

Problem

The gh aw campaign validate subcommand is implemented in the CLI but not properly documented in docs/src/content/docs/setup/cli.md. While line 288 mentions it briefly in the example list, there is no detailed section explaining what it does, how to use it, or what flags are available.

Evidence

Implementation: pkg/campaign/command.go lines 147-178

validateCmd := &cobra.Command{
    Use:   "validate [filter]",
    Short: "Validate campaign spec files for common issues",
    Long: `Validate campaign spec files under .github/workflows/*.campaign.md.
    
    This command performs lightweight semantic validation of campaign
    definitions (IDs, tracker labels, workflows, lifecycle state, and
    other key fields). By default it exits with a non-zero status when
    problems are found.
    ...
}

Documentation: docs/src/content/docs/setup/cli.md line 288 shows:

gh aw campaign validate                # Validate specs (fails on problems)

But there's no detailed section in the "Agentic campaigns" part of the documentation.

Expected Fix

Add a complete documentation section for campaign validate in the Agentic campaigns section that includes:

1. Full description of what validation checks are performed
2. Usage examples showing different scenarios
3. Flag documentation:
   • --json - Output validation results in JSON format
   • --strict / --no-strict - Control exit status behavior
4. When to use it - Best practices and use cases

Files to Update

• docs/src/content/docs/setup/cli.md - Add detailed section for campaign validate

Priority

Medium - This is a functional subcommand that users need to discover and understand how to use effectively.

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