[ExecuTorch][Core AI][3/x] PT2E quantizer front-end

[metascroy]

Adds CoreAIQuantizer, a PT2E front end wrapping coreai_opt. convert() runs the full coreai_opt finalize (convert_pt2e, conv/bn fold, Q/DQ to coreai:: rewrite) so the graph is export ready, then lowers through the Core AI partitioner. Includes quantization and quantized lowering tests.

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/21511

• 📄 Preview Python docs built from this PR

Note: Links to docs will display an error until the docs builds have been completed.

❌ 2 New Failures

As of commit 9bea1e5 with merge base 2a64e2d ():

NEW FAILURES - The following jobs have failed:

• pull / unittest / linux / linux-job (gh)
  RuntimeError: Command docker exec -t 4c29e92a36f2e55f2a0eb5260ae5e12ce5b37a2118ef8d580721afdd9dfa0177 /exec failed with exit code 1
• pull / unittest-editable / linux / linux-job (gh)
  RuntimeError: Command docker exec -t 239ee04cdb8319d8f24daed17dd1724f35e20e3f8b5da65141350b7546d468b0 /exec failed with exit code 1

This comment was automatically generated by Dr. CI and updates every 15 minutes.