Document flag validation constraints

[Mossaka]

Priority: P0 - Critical

Description

Add "Flag Combinations and Constraints" section documenting:

1. --skip-pull + --build-local = error
2. --allow-host-ports requires --enable-host-access

Undocumented Validation Constraints

Constraint	Code Location	Error Behavior
--skip-pull + --build-local	line 854-860	Error: incompatible flags
--allow-host-ports requires --enable-host-access	line 849-852	Error: missing dependency

Acceptance Criteria

• New section added to docs/usage.md
• Each constraint documented with error message shown
• Examples of correct vs incorrect usage

Files to Modify

• docs/usage.md

[github-actions]

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[github-actions]

🍪 Issue Monster has assigned this to Copilot!

I've identified this issue as a good candidate for automated resolution and assigned it to the Copilot agent.

Why this issue was selected:

• ✅ Priority: P0 - Critical (documentation)
• ✅ Clear acceptance criteria
• ✅ Part of issue CLI Documentation and Developer Experience Improvements #503 documentation improvements
• ✅ Separate from other work (documentation task)

Note: This is a sub-issue of #503 and can be combined with #495 in a single PR as recommended by the parent issue.

The Copilot agent will analyze the issue and create a pull request with the documentation updates.

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