docs(tasks): boundary lab shipped — B2 closed, four ear calls are the remaining gate

TASKS_DUMP.md

@@ -105,12 +105,19 @@ Standing rule: validate any new attempt against `Montreuil26_master/boundaries_g
 (14 user-confirmed) **first**. Note Montreuil has no per-orbit stems, so a stem-based lens
 cannot use it — that gap is itself worth fixing before attempt four.
 
-### B2 · Boundary webview  · unblocked, not started
-
-- [ ] Per-cut transition view: ±45 s waveform, markers at nominal/onset/takeover, click-to-
-      audition, export `boundaries.json`. Reuses `WaveformPlayer` + precomputed peaks.
-      With #13/#15 having no candidates this is a **plain audition-and-mark tool**, not an A/B —
-      simpler than originally scoped.
+### B2 · Boundary lab  ✅ SHIPPED (`192c6e9`)
+
+**→ http://192.168.1.3:8799/bounds.html** (LAN, phone-capable; smoke-tested against this
+exact server, 11/11). `j`/`k` next-prev · space play/pause · **Enter takes the playhead** ·
+drag to loop a span · candidate buttons audition from 4 s before. Export writes
+`boundaries-<gig>.json` in **master** seconds — merge into `verified` in the ear file.
+
+- [x] `build_bounds_set.py` renders a ±45 s clip per cut (not seeking the 817 MB master) and
+      emits peaks + candidates. Re-encoded, never `-c copy` — FLAC stream-copy snaps to frame
+      boundaries and every marker would inherit the offset.
+- [x] #13/#15 show an explicit **ear-only notice** rather than being omitted; they are exactly
+      the cuts that need a human.
+- [ ] **PLN: make the four calls.** ~1 min each. Then A1.4.
 
 ### B3 · The set-judge  ✅ SHIPPED