Compute LLK bring-up

This skill is a specialization of /implement-mock — specifically, Strategy A (stub in jit_hw/) applied to compute-kernel ops. The mechanics here all assume the silicon API lives at tt_metal/hw/inc/api/compute/<path>.h and produces a header-only shim under include/jit_hw/api/compute/.

For mock work outside compute (NOC, dataflow, dispatch, fabric, tensor), use /implement-mock for the broader strategy-picking flow. For batch bring-up (≥4 shims at once), see /parallel-mock-implementation.

When to invoke

User says one of:

• "bring up an LLK" / "bring up the X op"
• "write a shim for X" / "add an emule shim for X"
• "address the PCC failures on X"
• "implement the missing X SFPU op"