Instruction file imported from shifulegend/project-zero (.github/instructions/core.instructions.md). Copyright stays with the author.

Copilot scoped rules: core engine (adapter for docs/ai/engineering-rules.md)

Name: core
Author: shifulegend

Small single-responsibility TUs; src/<area>/x.c ⇄ include/<area>/x.h. Reuse simd_dispatch, GGUF reader, tn_aligned_*, tn_size_mul*, tn_get_free_ram.
No hardcoding: shape/tokens/quant/RoPE/MoE from GGUF metadata (hdr->arch prefix).
Memory safety: memset structs before partial init; overflow-checked size math; 64-byte aligned SIMD buffers; trap absurd allocations deterministically (not via malloc-NULL).
Cross-platform: AVX2..VNNI / NEON+dotprod / scalar all compile; TN_HAS_* gates; portable TN_PREFETCH_T1.
No new -Wall -Wextra -Wpedantic warnings; keep ASan/UBSan green.
Any bug found gets fixed in the same pass, even if pre-existing/unrelated to the task — log it in mistakes.md too, but that's not a substitute for fixing. Only defer for genuinely large architectural fixes, and flag those to the user explicitly. See engineering-rules.md § Bug-fix policy.

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