[Good First Issue] Document all fw subcommands with --help flags

[DimitriGeelen]

Problem

Many fw subcommands don't have a --help flag. Running fw audit --help or fw fabric --help either errors or shows nothing useful.

Proposed Solution

Add --help handling to each agent script that prints:

• One-line description
• Usage syntax
• Available flags/options
• Example commands

Files to Modify

Each agent script in agents/*/:

• agents/audit/audit.sh
• agents/fabric/fabric.sh
• agents/healing/healing.sh
• agents/context/context.sh
• etc.

How to Test

fw audit --help     # Should print usage
fw fabric --help    # Should print usage
fw healing --help   # Should print usage

Subsystem

Multiple (all agents)

This is a good issue for getting familiar with the agent script pattern across the codebase.