fix(riscv): accept c.lui rd=x0 hints - #326
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Summary
Accept the c.lui rd=x0 HINT code point. decode_q1 now rejects only the nzimm==0 reserved encoding; rd=x0 with nzimm!=0 decodes as lui x0, imm (a no-op HINT) and executes normally. The JIT boundary test no longer lists C.LUI rd=x0 as an illegal compressed encoding.
Validation
c_lui_rd0_hint: HINT decodes as lui x0, imm; rd!=0 control decodes normally; nzimm==0 stays reserved.cargo test --lib c_lui_rd0_hintpasses on the master base above.Closes #321