Refactor maker planning into pure preflight and cycle plan

[wjllance]

Summary

• Add a top-level make maker shortcut for the default paper workflow.
• Split maker execution into a pure preflight step and a deterministic cycle planner so market checks, inventory exit logic, and quote generation are easier to test.
• Update the sample maker config and docs so the example paper setup keeps active inventory exit disabled by default.
• Add coverage for divergence skipping, halted exit suppression, and pending-order exposure caps.

Testing

• Added unit tests for the new preflight and planning behavior.
• Updated config parsing coverage to verify the example TOML keeps active inventory exit off.
• Not run (not requested)