feat: inspect exact IQ4 artifacts and extend bounded emulation

[forkwright]

Continues #150 after merged #154.

• Add inspection-only IQ4_XS (256 elements/136 bytes) and IQ4_NL (32/18) layouts verified against pinned primary GGML sources; preserve explicit decode refusal and reject malformed block rows, offsets and unknown types.
• Add a typed unknown-storage diagnostic with numeric-only stderr while preserving byte-exact v1 error stdout.
• Add original VGPR-only v_mul_f32_e32 emulation in the existing finite-normal input/result domain, with pinned compiler-byte round-trip and independent numeric oracle. No new FP mode, memory/control state or full-kernel claim.
• Reconcile authored scheduler/architecture descriptions with the merged process-local controller.

Validation: denied locked workspace tests, strict all-target Clippy, release loader/emulation tests, three pinned AOMP fixture witnesses, focused final loader/bin checks, format and repository guards. Independent format and ISA reviews cleared the changes. Minimal optimized inspector has no HIP/device-runtime dependency.

Exact file observations through the reviewed one-file read-only boundary now bind the text Qwen3.8-27B GGUF and Qwen3 embedding Q8 artifact to their immutable publisher LFS hashes. The text file declares qwen35 and seven actual storage types. Reranker bytes have an observed digest, but its conversion/publisher chain remains unverified. These observations do not establish payload decoding, model quality, derived VRAM requirements, native serving or GPU qualification. No model execution or live fleet changes occurred.