docs(board): point a cold reader at the truth, not at the oldest theory

TASKS_DUMP has accreted amendments since 2026-08-16 and the oldest sections are
now the least true — but a reader arrives at the top, where A3 still says
/take-five-drops uploaded '24s short', that every other track 'matched to the
second', that 8 of 15 are up, and that no artwork exists. All four are wrong,
and the first two are the exact reasoning that let six stale uploads pass a
duration check in August.

So: a READ THIS FIRST banner naming what is superseded and sending the reader to
the resume points at the end, plus an inline stop sign at A3's 'TWO DEFECTS'
where someone reading that epic top-down actually hits it. The wrong diagnosis
is kept rather than deleted, because the reasoning being auditable is the point —
it just no longer gets to be the first thing anyone reads.

A board whose front page is a year of stale confidence is worse than no board.
Nobody rewrites 1700 lines; they act on line 90.

TASKS_DUMP.md

@@ -19,6 +19,31 @@ certainly right but I cannot re-read them, so **treat a #17x number as a name, n
 
 ---
 
+## 🧭 READ THIS FIRST (2026-09-05)
+
+This file has accreted amendments since 2026-08-16 and the OLDEST sections are the
+LEAST true. Start at the bottom:
+
+- **`🔴 RESUME POINTS` (end of file)** — R1–R5, written for a reader with zero
+  context: exact commands, paths, artifacts already on disk, and the decisions that
+  are PLN's rather than a machine's.
+- **`⚠️ SHARED-CHECKOUT HAZARD` (end of file)** — read before committing anything in
+  Sound/Tidal. `git push origin master` from a non-master HEAD exits 0 and pushes
+  nothing; it already cost four commits.
+
+**Superseded below, do not act on it:**
+- **A3's "TWO DEFECTS TO FIX FIRST"** — wrong. `/take-five-drops` was never "24 s
+  short"; it is the Aug-12 render generation, and it is 1 of **14** stale uploads,
+  not 1 of 2 defects. And "every other track matches to the second" was a loose
+  tolerance, not a verdict. See the 2026-09-05 amendments.
+- **A3's account table ("8 of 15 uploaded")** — re-read the account instead:
+  6 correct v4 · 14 stale · 7 never uploaded. `sc_pull_2026-09-05/` has the truth.
+- **A3's "NOT YET DONE: artwork"** — artwork EXISTS on 8 stale uploads and on the
+  full set; 101 originals are archived. It was never attached by our tooling.
+- **The catalog is no longer stale** and `check-mix.py`'s argv bug is fixed.
+
+---
+
 ## EPIC A — OPAL-26 release  ⟵ *the only epic blocking a shipment*
 
 North star: get "Sunset Forest" (opal-festival-2026, 2026-08-08) released. 14 tracks —
@@ -114,6 +139,11 @@ cd ~/Work/Sound/tidal-ears && .venv/bin/python -m tidal_ears.cli master sc form-
     --sharing private --state ../Prod/Opal26_master/release/sc_state.json --go
 ```
 
+⛔ **SUPERSEDED 2026-09-05 — the two items below are the WRONG diagnosis.** Kept
+only so the reasoning is auditable. Defect 1 is not a truncation, it is a stale
+render generation, and there are 14 of them not 1. Defect 2 stands. Jump to the
+2026-09-05 amendments and the resume points.
+
 **TWO DEFECTS TO FIX FIRST:**
 1. **`/take-five-drops` uploaded SHORT — 6:57 on SoundCloud vs 7:21 in the plan (440.7 s),
    ~24 s missing.** Every other track matches to the second. Delete it on SoundCloud and