Add causal person fusion and MuVAP stage-3 baselines

PROJECT_CONTEXT.md

@@ -73,6 +73,40 @@ result.
   See the immutable
   [`result record`](results/easycom_track_gru_residual_4ep_2026-09-07/README.md)
   and [`implementation note`](docs/easycom_track_gru_residual.md).
+- `causal-person-adapter-v2` is now implemented but unmeasured. It preserves an
+  exact matched pooled `G+A+V` base, reuses the same causal anonymous track
+  histories, replaces the blocking zero scalar with a sample-dependent vector
+  gate, and zero-initializes only the final residual-logit projection. Its
+  isolated runbook is
+  [`docs/easycom_causal_person_adapter_v2.md`](docs/easycom_causal_person_adapter_v2.md).
+  This is an optimization-repair/incremental screen, not evidence that track
+  identity matters.
+- `causal-person-adapter-egospeak-gru` is an unmeasured controlled ablation of
+  V2. It changes only the per-track visual temporal stem to EgoSpeak
+  MiniROADA's `Linear-LN-ReLU-Dropout-GRU-ReLU` ordering while retaining V2's
+  pooled base, G+A person query, set attention, dynamic gate and zero-output
+  residual. It is an EgoSpeak-style per-track adaptation, not a reproduction of
+  EgoSpeak's global 5 Hz RGB+audio GRU. See its
+  [`runbook`](docs/easycom_egospeak_style_person_gru.md).
+- `highrate-person-av-attention` is now implemented but unmeasured. A separate
+  extractor runs the published, frozen MuVAP frontend at 25 Hz: mixed audio is
+  encoded once as a shared CPC stream, while each face track contributes a
+  causal visual state plus one AV active-speaker score. At each 5 Hz right edge
+  `G+U` queries that variable person set. The first screen loads and freezes
+  the matched trained global-Omni + traditional-audio base and learns a
+  zero-initialized person-logit residual. This is global Omni context plus
+  traditional high-rate audio/person perception;
+  it is not the full MuVAP forecasting model and does not yet include online
+  detection. See the
+  [`runbook`](docs/easycom_highrate_person_av.md).
+- A MuVAP-only Stage-3 baseline is now implemented as a clean-room paper
+  reconstruction. It freezes the released 25 Hz mono role-VAP and causal ASD
+  backbones, lets `Z_VAP` query the variable `Z_ASD` person set at each frame,
+  applies a one-layer causal temporal Transformer, and trains only that fusion
+  plus the EgoSpeak 10-horizon head. It deliberately excludes Omni and is not
+  described as upstream Stage-3 code because that entry point remains
+  unpublished. See the
+  [`runbook`](docs/easycom_muvap_stage3_baseline.md).
 
 ### Measured oracle-information screen
 
@@ -305,3 +339,6 @@ Do not reorganize them physically without compatibility wrappers.
 - Remote paths differ (`/data/...` and `/data1/...`). Commands should expose
   dataset/model roots as variables rather than hard-code one machine.
 - Large models, datasets, checkpoints and extracted features live outside Git.
+  The explicitly audited 72 MiB MuVAP ASD-CPC release and 7 MiB CPC frontend
+  are a deliberate exception: they are vendored with their exact source and
+  provenance under `third_party/MuVAP` for reproducible extraction.