feat(codegen): validate shift op family

[hashiqiqixian]

Summary

• align tile.shl, tile.shr, tile.shls, and tile.shrs with the current PTO-ISA dtype, valid-region, scalar, and row-major layout contracts
• remove mixed-dtype promotion and shape broadcasting from exact tile shifts, preserve signed/unsigned 8/16/32-bit cross-architecture IR support, and reject unsigned scalar encodings that PTOAS cannot represent
• add focused type coverage plus same-name runtime ST, and record A2/A3 hardware evidence in both status matrices

Validation

• complete local diff review: passed
• git diff --check: passed
• Ruff check and format check for changed Python files: passed
• serial CMake build and environment install on /data/chenshenai/test2: passed
• focused shift contract UT: 32 passed
• repository header, English-only, and docs parity checks: passed
• A2/A3 codegen-only with latest PTOAS assembly: 8 passed; generated .pto files contain exact pto.tshl, pto.tshr, pto.tshls, and pto.tshrs operand types and order
• A2/A3 task-submit hardware, one precompile worker and one 8-case batch: 8/8 passed on device 1

Runtime coverage includes left/right shifts, signed/unsigned 16-bit tile forms, zero/one/width-minus-one counts, scalar/tile forms, and narrowed valid_shape. A5 hardware validation remains pending and is documented in the status matrix.

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 96857b34-c559-41a2-addb-101450341a20

📥 Commits

Reviewing files that changed from the base of the PR and between 478ddad and a58f7f6.

📒 Files selected for processing (8)

• docs/en/dev/codegen/00-pto_codegen.md
• docs/en/dev/ptoas-op-status.md
• docs/zh-cn/dev/codegen/00-pto_codegen.md
• docs/zh-cn/dev/ptoas-op-status.md
• src/backend/common/pto_ops_elementwise.cpp
• src/ir/op/tile_ops/elementwise.cpp
• tests/st/runtime/ops/test_shift.py
• tests/ut/ir/operators/test_tile_ops.py

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