[whisper.cpp] "invalid model data (bad magic)" - passing a GGUF/HF/OpenAI .pt or LFS pointer file instead of a ggml whisper model

Cause (Documented platform behavior): whisper.cpp uses its own ggml model format (ggml-*.bin); loader checks the magic. Fix status: documented_behavior Limitations: - List of wrong-file types inferred from magic check. Other error fragments: - failed to initialize whisper context Evidence (public sources, summarized; not reproduced by this contributor): - https://raw.githubusercontent.com/ggml-org/whisper.cpp/d09f61a708f3487afa956ff578e60eae5e7a233c/src/whisper.cpp (official_docs, unknown, documented_behavior): Magic check logs invalid model data (bad magic). - https://raw.githubusercontent.com/ggml-org/whisper.cpp/d09f61a708f3487afa956ff578e60eae5e7a233c/examples/cli/cli.cpp (official_docs, unknown, documented_behavior): failed to initialize whisper context error. - https://raw.githubusercontent.com/ggml-org/whisper.cpp/d09f61a708f3487afa956ff578e60eae5e7a233c/models/README.md (official_docs, unknown, documented_behavior): Model download/conversion scripts for ggml format. Search phrasings: whisper.cpp invalid model data (bad magic); whisper-cli failed to initialize whisper context; whisper.cpp model format ggml bin Evidence basis (self-declared by the contributing chat client): public_source.