Picker: identify the analyst (initials) per pick

Each annotation row now carries an `analyst` column. On first visit the
web picker shows a small login modal asking for initials, persists them
in localStorage, and shows the badge in the top-right. Click the badge
to change identities. Submissions without initials are rejected by the
backend (HTTP 400). Skip remains analyst-free.

Backfill: every existing barrier_opening.csv row marked as `GG` since
all current picks were done by Giorgio.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

scripts/barrier_picker_app/app.py

@@ -54,7 +54,7 @@ DB_NAME_RE = re.compile(
 )
 
 OUT_COLS = ["machine_name", "session_date", "session_time",
-            "opening_s", "trim_first_s", "bad_rois", "notes"]
+            "opening_s", "trim_first_s", "bad_rois", "analyst", "notes"]
 
 # ROI numbering in the HD mating arena (verified via tracking_geometry):
 #   upper row = ROIs 1, 3, 5    (y ≈ 0.125)
@@ -275,6 +275,7 @@ class Submission(BaseModel):
     idx: int
     time_s: float | None  # None when marking unusable
     mode: str             # "all" | "upper" | "lower" | "unusable" | "skip"
+    analyst: str = ""     # initials of the human picker (required, non-skip)
     notes: str = ""
 
 
@@ -288,6 +289,10 @@ async def submit(payload: Submission) -> dict:
     if payload.mode == "skip":
         return {"status": "skipped"}
 
+    analyst = payload.analyst.strip().upper()
+    if not analyst:
+        raise HTTPException(status_code=400, detail="analyst initials required")
+
     if payload.mode == "unusable":
         row = {
             "machine_name": item.machine_name,
@@ -296,6 +301,7 @@ async def submit(payload: Submission) -> dict:
             "opening_s": float("nan"),
             "trim_first_s": 0,
             "bad_rois": "",
+            "analyst": analyst,
             "notes": payload.notes or "unusable",
         }
     else:
@@ -315,6 +321,7 @@ async def submit(payload: Submission) -> dict:
             "opening_s": round(payload.time_s, 1),
             "trim_first_s": 0,
             "bad_rois": bad_rois,
+            "analyst": analyst,
             "notes": payload.notes,
         }