Clarify --image-tag behavior with presets

[Mossaka]

Priority: P3 - Low

Description

Clarify that --image-tag interacts with --agent-image presets:

• default preset uses agent:<tag>
• act preset uses agent-act:<tag>

Acceptance Criteria

• Documentation clarifies image name varies by preset
• Help text updated to explain this

Files to Modify

• docs/usage.md
• src/cli.ts (help text only)

[github-actions]

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