docs(drive-abci): document that direct purchases bypass token pause by design

[QuantumExplorer]

Summary

• Add security comment to direct purchase validation explaining why pause check is intentionally absent
• Prevents future security audits from flagging it as a missing check

Context

A security audit flagged that direct purchase validation does not check token_status.paused() unlike transfer validation. This is by design: a paused token restricts transfers but not purchases. This allows token issuers to pause trading/movement while still permitting new buyers to acquire tokens.

Test plan

• Comment only, no code changes

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 5446114e-17ab-45dc-99ff-b6530d2a98fa

📥 Commits

Reviewing files that changed from the base of the PR and between b0c1667 and 3661b32.

📒 Files selected for processing (1)

• packages/rs-drive-abci/src/execution/validation/state_transition/state_transitions/batch/action_validation/token/token_direct_purchase_transition_action/state_v0/mod.rs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch docs/direct-purchase-pause-by-design

📝 Coding Plan

• Generate coding plan for human review comments

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