Add causal person fusion and MuVAP stage-3 baselines

third_party/README.md

@@ -1,7 +1,9 @@
 # Third-party reference code
 
-Reference repositories are inspected here but are not vendored into this
-project. They are not runtime dependencies.
+Audited reference repositories are vendored here so a normal clone of this
+project contains the exact source used by the experiments.  The nested
+upstream `.git` directories are deliberately removed; each checkout records
+its immutable source commit in `.upstream-revision`.
 
 The track-GRU design was checked against the official EgoSpeak repository at
 revision `b5bee35e796d8f2d6aa7da2bf1b07836270f8bfb`:
@@ -11,5 +13,33 @@ git clone https://github.com/jun297/EgoSpeak.git third_party/EgoSpeak
 git -C third_party/EgoSpeak checkout b5bee35e796d8f2d6aa7da2bf1b07836270f8bfb
 ```
 
-`third_party/EgoSpeak/` is intentionally ignored. No EgoSpeak source file is
-copied or imported by the project implementation.
+The project implementation does not import EgoSpeak at runtime. Its source is
+retained for implementation comparison and license/provenance auditing.
+
+The high-rate local AV extractor imports the vendored official MuVAP ASD
+implementation at audited revision `a1ef9c8` and its published `asd-cpc`
+weights. The MuVAP-only Stage-3 reconstruction additionally uses the published
+25 Hz `vap-role-cpc` release. To refresh this vendored copy intentionally,
+clone and audit the new revision outside the project first, then update the
+source, weights and `.upstream-revision` together:
+
+```bash
+git clone https://github.com/Haotian-Qi/MuVAP.git third_party/MuVAP
+git -C third_party/MuVAP checkout a1ef9c8
+python third_party/MuVAP/tools/fetch_frontends.py cpc
+huggingface-cli download Haotian-Qi/MuVAP \
+  --include 'asd-cpc/*' 'vap-role-cpc/*' \
+  --local-dir third_party/MuVAP/weights
+```
+
+The published `asd-cpc`/`vap-role-cpc` releases and CPC frontend are retained
+in this directory. The extractors hash each consumed release into every
+feature contract.
+It imports this exact checkout directly, so an editable install is not
+required. In an established Qwen container, avoid letting MuVAP's package
+metadata replace the working PyTorch/Transformers stack. The additional import
+requirements are `torchaudio`, `einops`, and `PyYAML`; verify/install only the
+missing packages.
+
+See [`docs/easycom_highrate_person_av.md`](../docs/easycom_highrate_person_av.md)
+for the causality contract and experiment commands.