add qwen3 scope3 tile helper example

[high-cloud]

What changed

• Added examples/models/qwen3/qwen3_32b_decode_scope3_tile.py as a tile/helper-oriented Scope 3 example for Qwen3 decode.
• Kept the optimized fused gate/up and fused down-projection InCore helpers in the new file so the tile-level structure is easy to inspect independently.
• Added stage comments aligned to the current InCore execution order.

Why

The existing qwen3_32b_decode_scope3.py file is useful for baseline scope validation, but the optimized helper version is easier to review when inspecting tile-level structure and fused InCore boundaries.

Impact

• Adds a standalone example for reviewing and iterating on the current Scope 3 tile/helper implementation.
• Does not change existing examples or runtime behavior outside the new file.

Performance

The helper structure in qwen3_32b_decode_scope3_tile.py comes from the same Scope 3 fusion work that was profiled on examples/models/qwen3/qwen3_32b_decode_scope3.py with runtime profiling enabled.

Measured with:

• python examples/models/qwen3/qwen3_32b_decode_scope3.py -p a2a3 -d 7 --runtime-profiling

Representative results:

• Baseline Scope 3 implementation: 3295.18 us
• Fused gate/up helper: 3038.68 us (-7.8% vs baseline)
• Fused gate/up + fused down-projection helper: 2822.68 us (-14.3% vs baseline, -7.1% vs gate-only fused)

Validation

• python examples/models/qwen3/qwen3_32b_decode_scope3_tile.py -p a2a3 -d 7
• python examples/models/qwen3/qwen3_32b_decode_scope3.py -p a2a3 -d 7 --runtime-profiling

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