Add UVM integration guide and SystemVerilog UVM kernel code for CHIron#3

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Commits on Mar 31, 2026

Add UVM integration guide, quickstart, and SV/UVM code for CHIron kernel usage

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Fix code review issues: opcode overlap in pack_req, missing LikelyShared field, CLOG_ISSUE_E macro, clock syntax

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Kumonda221-CrO3
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