update docs

tools/mtmd/README-dev.md

@@ -28,6 +28,12 @@ A typical pipeline of the core libmtmd is as follows:
 - Single image or batch is encoded, via `mtmd_encode()` or `mtmd_batch_encode()`
 - Get the output embeddings
 
+## Helper
+
+We provide a set of helper functions via `mtmd_helper` to make using libmtmd easier. The helper provides:
+- Image, audio and video file decoding (for example, decode raw JPEG into RGB bitmap)
+- Manage `llama_batch` and calls to `llama_decode`
+
 ## Audio generation support
 
 Audio generation is added to mtmd in PR [#26254](https://github.com/ggml-org/llama.cpp/pull/26254)
@@ -65,10 +71,8 @@ Due to wide variety of audio generation pipelines, the `mtmd_gen_audio` system i
     - 10% changes inside `libmtmd` and `clip.cpp` systems
     - The rest downstream code (CLI, server) should have no changes at all
 
-IMPORTANT: if the model requires any changes that doesn't fit into the existing infrastructure, **open an issue** first for discussion. Any new components must be verified to respect the API design constraints stated above
+IMPORTANT: If your model needs changes that don't fit the existing infrastructure, **open an issue first for discussion**.
 
-## Helper
-
-We provide a set of helper functions via `mtmd_helper` to make using libmtmd easier. The helper provides:
-- Image, audio and video file decoding (for example, decode raw JPEG into RGB bitmap)
-- Manage `llama_batch` and calls to `llama_decode`
+No-go checklist (these will get the PR rejected and require discussion before proceeding):
+- Violating the API design constraints stated above
+- Adding a new model-specific binary: the API and binary surface must stay model-agnostic