Add Q6A build artifacts: cross-compiled llama-cli + Hexagon NPU DSP libraries

build/q6a/README.md

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+# Q6A (Radxa Dragon Wing) Build Artifacts
+
+Cross-compiled llama.cpp with Hexagon NPU backend for Qualcomm QCS6490.
+
+## Structure
+
+- `bin/llama-cli` -- ARM64 llama-cli binary, cross-compiled with Hexagon DSP support
+- `dsp/` -- DSP-side FastRPC skeleton libraries (deployed to `/usr/lib/rfsa/adsp/`)
+  - `libggml-htp-v68.so` -- main HTP v68 DSP library
+  - `libggml-htp-v68-nostart.so` -- variant without startup code
+  - `libggml-htp-v68-test.so` -- minimal test skeleton
+  - `libhtp_minimal_skel.so` -- stripped-down skeleton for debugging FastRPC loading
+- `lib/` -- Host-side Hexagon backend libraries
+  - `libggml-hexagon.so.0.9.11` -- Hexagon backend shared library (CPU-side)
+  - `libggml-htp-v68.so` -- copy of DSP library for reference
+
+## Status
+
+DSP library loading fails with error 0xe (AEE_EUNSUPPORTED) from `remote_handle64_open`.
+FastRPC transport itself works (calculator test passes). Root cause suspected: DSP runtime
+library mismatches or URI/skel entry point mismatch.