fix(career): gig backfill offsets by qualifying taken, not picks length

CodeRabbit on #954: after the stakes loop appends near-bar songs,
qualifying[len(picks):] overshoots and skips eligible qualifying songs
— a stocked passport could still get a short set.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

plugins/career/routes.py

@@ -722,17 +722,19 @@ def setup(app, context):
         # first gig is how stubs start. random per call = free re-roll.
         random.shuffle(qualifying)
         rest.sort(key=lambda s: -s["best_accuracy"])
-        picks = qualifying[:max(1, size - cfg["stakes_songs"])]
+        qtaken = max(1, size - cfg["stakes_songs"])
+        picks = qualifying[:qtaken]
         for s in rest:
             if len(picks) >= size:
                 break
             picks.append(s)
         # Surplus qualifying songs backfill a short set — a mature passport
-        # with no near-bar songs left must still fill the bill.
+        # with no near-bar songs left must still fill the bill. Offset by how
-        for s in qualifying[len(picks):] if len(picks) < size else []:
+        # many QUALIFYING songs were taken, not len(picks): rest's stakes
+        # additions would otherwise skip eligible qualifying songs entirely.
+        for s in qualifying[qtaken:]:
             if len(picks) >= size:
                 break
-            if s not in picks:
             picks.append(s)
         if len(picks) < size:
             exclude = {s["filename"] for s in picks}

tests/plugins/career/test_passports.py

@@ -358,3 +358,16 @@ def test_gig_propose_backfills_from_surplus_qualifying(client, meta_db):
     res = client.post("/api/plugins/career/gigs/propose",
                       json={"instrument": "guitar", "genre": "Ska", "size": 5})
     assert len(res.json()["songs"]) == 5
+
+
+def test_gig_propose_backfill_offset_survives_stakes(client, meta_db):
+    # 4 qualifying + 1 near-bar stake, size 5: the stake must not shift the
+    # qualifying backfill window past eligible songs.
+    for i in range(4):
+        meta_db.add(f"q{i}.feedpak", 0, 0.9, genre="Reggae", arrangements=LEAD)
+    meta_db.add("near.feedpak", 0, 0.7, genre="Reggae", arrangements=LEAD)
+    res = client.post("/api/plugins/career/gigs/propose",
+                      json={"instrument": "guitar", "genre": "Reggae", "size": 5})
+    files = [s["filename"] for s in res.json()["songs"]]
+    assert len(files) == 5 and len(set(files)) == 5
+    assert "near.feedpak" in files