feat(igla): Wave Loop 771 — module-scope [361][2]^6 Pt non-power-of-two outer-dimension array-of-struct variable from call with indexed signed writes#1479
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…wo outer-dimension array-of-struct variable from call with indexed signed writes (Closes #1742)
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Closes #1742\n\nWave Loop 771 extends the packed array-of-struct odd-outer-dimension ladder to [361][2]^6 Pt (23,104 elements, 739,328-bit vector, ~0.705 MiBit).\n\n- Witness: specs/scratch/w771_bench_module_361x2p6_aos_var_call_write.t27\n- Generator: scripts/gen_w771.py\n- Integration test: accepts_w771_bench_module_361x2p6_aos_var_call_write\n- Seal: .trinity/seals/scratch_w771_bench_module_361x2p6_aos_var_call_write.json\n- Report + W772 cooperation variants: docs/reports/FPGA_LOOP_CLOSEOUT_W771_2026-07-24.md and .claude/plans/wave-loop-772.md\n- Zero compiler or reference-model changes; FROZEN_HASH unchanged.\n\nVerification:\n- cargo build --release -p t27c: OK\n- cargo test -p t27c --bin t27c: 1494/0/2\n- cargo test -p tri: 78/0\n- cargo test -p t27c --test icarus_lowerable: 231/0\n- t27c parse|icarus-lowerable|icarus-simulate|icarus-cocotb|seal --save W771: PASS\n\n🤖 Generated with Claude Code