feat(v1): add pose quality evidence

docs/07-v1-implementation-plan.md

@@ -245,7 +245,7 @@ git commit -m "feat(v1): add verified pose adapter"
 - Create: `v1/tracking.py`
 - Create: `v1/tests/test_evidence.py`
 
-- [ ] **Step 1: Write quality tests**
+- [x] **Step 1: Write quality tests**
 
 ```python
 def test_missing_ankles_rejects_pose(person_pose_without_ankles):
@@ -258,12 +258,12 @@ def test_horizontal_body_is_evidence_not_event(horizontal_pose):
     assert evidence.horizontal_pose is True
 ```
 
-- [ ] **Step 2: Run tests to verify failure**
+- [x] **Step 2: Run tests to verify failure**
 
 Run: `python -m pytest v1/tests/test_evidence.py -v`
 Expected: FAIL because quality and evidence functions are missing.
 
-- [ ] **Step 3: Implement floating-point evidence**
+- [x] **Step 3: Implement floating-point evidence**
 
 ```python
 def assess_pose_quality(pose: PersonPose, threshold: float) -> PoseQuality:
@@ -275,12 +275,12 @@ def assess_pose_quality(pose: PersonPose, threshold: float) -> PoseQuality:
 
 Use float coordinates, clamped cosine inputs, torso-normalized vertical motion, and no boolean alarm result in this module.
 
-- [ ] **Step 4: Run tests**
+- [x] **Step 4: Run tests**
 
 Run: `python -m pytest v1/tests/test_evidence.py -v`
 Expected: PASS.
 
-- [ ] **Step 5: Commit**
+- [x] **Step 5: Commit**
 
 ```powershell
 git add v1/evidence.py v1/tracking.py v1/tests/test_evidence.py docs progress.md