feat(v1): add verified pose adapter

docs/07-v1-implementation-plan.md

@@ -190,7 +190,7 @@ git commit -m "feat(v1): add replayable video source"
 - Create: `v1/pose.py`
 - Create: `v1/tests/test_pose.py`
 
-- [ ] **Step 1: Write adapter shape tests**
+- [x] **Step 1: Write adapter shape tests**
 
 ```python
 def test_pose_adapter_rejects_non_pose_model(tmp_path):
@@ -202,12 +202,12 @@ def test_person_pose_has_seventeen_keypoints(fake_yolo_result):
     assert len(poses[0].keypoints) == 17
 ```
 
-- [ ] **Step 2: Run tests to verify failure**
+- [x] **Step 2: Run tests to verify failure**
 
 Run: `python -m pytest v1/tests/test_pose.py -v`
 Expected: FAIL because `PoseAdapter` is missing.
 
-- [ ] **Step 3: Implement only the adapter contract**
+- [x] **Step 3: Implement only the adapter contract**
 
 ```python
 from typing import Sequence, Tuple
@@ -226,12 +226,12 @@ class PoseAdapter:
 
 At construction, hash the model, require task `pose`, class `person`, and exactly 17 three-value keypoints.
 
-- [ ] **Step 4: Run tests and a real model smoke**
+- [x] **Step 4: Run tests and a real model smoke**
 
 Run: `python -m pytest v1/tests/test_pose.py -v; python -c "from ultralytics import YOLO; assert YOLO('demo/best.pt').task == 'pose'"`
 Expected: PASS and no assertion error.
 
-- [ ] **Step 5: Commit**
+- [x] **Step 5: Commit**
 
 ```powershell
 git add v1/pose.py v1/tests/test_pose.py docs progress.md