docs(handoff): scoreboard units 1-10 landed; providers + goal inputs remain

HANDOFF.md

@@ -1,26 +1,29 @@
-# HANDOFF — 2026-10-30 (audio dock shipped; needs an eyes/hands pass)
+# HANDOFF — 2026-10-30 (scoreboard built to the polling policy; two wiring items left)
 
 ## State
 
-- Branch `main`, worktree clean. Ten dock units landed on top of the design conversion; nothing
-  pushed since `1724922` — this batch is local.
-- **The sound bars exist**: `Controls/AudioDock` — master strip on top (nearest the preview), four
-  bays below (MIC / GAME / TRAX / LIP-SYNC), 148px, auto-collapsing to 36px below a 900px window
-  height. The dock is now the ONLY audio surface; the preview's mic row, game chip, TRAX button and
-  sync slider are deleted.
-- Faders speak dB (`Helpers/GainDb`, 0 dB = unity). Ladders are measured (`SegmentMeter` +
-  `MeterScale`), never decorative. The duck badge prints the gain the mixer applied.
-- **MONO output** (creator ruling): folds the finished mix to both channels, persisted as
-  `Audio.MonoOutput`, one click in the master strip. Exists because single-sided audio is inaudible
-  with profound right-side deafness, not merely unbalanced.
-- Deliberately absent: L/R ladders (one ladder + an imbalance flag instead), TRAX scrub/prev-next
-  (OBS territory), CPU/GPU/NVENC readouts, acrylic.
+- Branch `main`. The audio dock is shipped and pushed. **The scoreboard is built** in ten units,
+  local commits only: tallies (`Models/ScoreboardState`, session-scoped), lifecycle
+  (`ScoreboardRecorder`: start clears, End freezes), layout (`Models/ScoreboardLayout`: coupled
+  edges resolved at render time, shrink-then-wrap, never scroll), renderer
+  (`Services/Compositor/ScoreboardRenderer`: plate + text colour + opacity + 14–24px, cached),
+  tile selection (`Models/ScoreboardTiles`, opt-in, money per currency), the cached presenter, the
+  layer itself (`SourceType.Scoreboard`, strip geometry, resolver case), the properties panel
+  (eight fact switches + colours + plate + size, theme widgets only), the Analytics scope
+  (`yt-analytics.readonly`, incremental, `HasAnalyticsScope`), and the polling policy
+  (`Models/ScoreboardCadence`).
+- Fixed on the way: the chat feed now reaches the tallies (the recorder had no caller).
 
 ## Next action
 
-Nothing queued. **Needs the creator's hands**: launch and judge the dock at the real window size —
-bay proportions at 148px, the master strip's ladder/label density, and whether the MONO fold sounds
-right through their own ears/headphones (the one thing no test can answer).
+1. **HTTP providers** behind the cadence policy: watch hours (`reports.query`,
+   `metrics=estimatedMinutesWatched`) and subscriber count (`channels.list?mine=true&part=statistics`),
+   both behind an interface with a fake for tests, plus the timer that calls
+   `ScoreboardCadence.Due(...)` and writes the values into `ScoreboardTiles`.
+2. **Goal-target inputs** in the properties panel (the tiles read `SubscriberGoal`/`WatchHourGoal`
+   but nothing sets them yet).
+3. **On-screen check** of the strip: one line at 24px, plate/opacity, and the edge swap against the
+   social bar.
 
 ## Landmines