[Feat][Manifest] Promote non-LA code-present ops

[superAngGao]

Summary

Promote existing code-present operators into the release-facing manifest surface for the bounded #1660 batch, excluding Linear Attention and Mamba2/SSD work.

This PR adds manifest coverage for:

• RoPE variants, including RopeNeoxPositionIdsOp
• DropoutOp
• narrow FP8 helper surfaces: FP8QuantOp, FP8LightingIndexerOp
• TopkSelectorOp
• standalone GroupedGemmOp
• Engram fwd/bwd/decode
• FFTC2COp
• MHCPreOp / MHCPostOp

It also adds matching roofline formulas for these promoted entries.

Scope notes

This PR intentionally keeps the current runtime surface as the source of truth and avoids broad API redesigns. In particular:

• Linear Attention and Mamba2/SSD promotion are left out of this batch.
• New low-precision compute-core contracts such as FP8 GEMM, block-scaled GEMM, low-bit GEMM, sparse GEMM, and special swizzled layouts are out of scope.
• _infer_output_shapes coverage and manifest-driven benchmark migration are kept as follow-up work. Existing validator warnings in those areas are advisory and do not block validate_manifest.py --strict.
• Existing benchmark files are referenced with bench_manifest_driven: false to represent the current coverage honestly.

Validation

Ran in the TileOpsGov CI Docker image:

docker run --rm --entrypoint /bin/bash --gpus all --ipc host \
  -e PYTHONDONTWRITEBYTECODE=1 \
  -e PYTHONPYCACHEPREFIX=/tmp/pycache \
  -e RUFF_CACHE_DIR=/tmp/ruff-cache \
  -v /home/ga/TileOPs-issue1650-wave0:/workspace \
  -w /workspace \
  ghcr.io/tile-ai/tileops-runner:65dbc98-torch2.10 \
  -lc 'python scripts/validate_manifest.py --strict'

docker run --rm --entrypoint /bin/bash --gpus all --ipc host \
  -e PYTHONDONTWRITEBYTECODE=1 \
  -e PYTHONPYCACHEPREFIX=/tmp/pycache \
  -e RUFF_CACHE_DIR=/tmp/ruff-cache \
  -v /home/ga/TileOPs-issue1650-wave0:/workspace \
  -w /workspace \
  ghcr.io/tile-ai/tileops-runner:65dbc98-torch2.10 \
  -lc 'python -m ruff check tileops/perf/formulas.py'

Both passed. validate_manifest.py --strict reports existing advisory warnings for shape-infer rollout and non-manifest-driven benches, but no hard errors.

Closes #1660.
Part of #1650.

[gemini-code-assist]

Code Review

This pull request introduces several new operators to the manifest—including FP8 lighting indexer, Top-K selector, grouped GEMM, various RoPE variants, FP8 quantization, dropout, Engram, FFT, and MHC operators—along with their corresponding roofline performance formulas in tileops/perf/formulas.py. The review feedback highlights critical correctness issues in several of the newly added roofline formulas: FP8LightingIndexerOp misses element size scaling for its inputs; FFTC2COp incorrectly calculates bytes due to unsupported complex types in _dtype_itemsize; and both MHCPreOp and MHCPostOp contain severe math errors that enormously overestimate FLOPs and miscalculate memory traffic by omitting dtypes, tensors, or batch dimensions.

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[zhen8838]

Approved after re-reviewing current head 4d660c0. The earlier manifest workload/source-path blockers are fixed and required CI is green.