Column-staggered right half, and record the ragged-edge decision

Six clean finger columns then an outer pinky edge carrying Bksp, ] and Enter,
with backslash alone in an eighth column. Documents why the artifact exists -
the number row and alpha rows are cut half a unit apart - and the three ways
to resolve it. Also flags the right thumb being asked to cover five keys.

Co-Authored-By: Claude Opus 5 <[email protected]>

README.md

@@ -193,6 +193,34 @@ comes from — a stock 104 puts Tab, Caps, Shift *and* Ctrl on the weakest finge
 outermost is at the edge of thumb travel. Consider dropping Ctrl to a home-row
 mod and reclaiming that slot for a layer key.
 
+The right is worse: **five** thumb keys (Space / Alt / Win / Menu / Ctrl). One
+thumb will not cover five. Menu is the obvious deletion — nothing else on the
+board is used less.
+
+`docs/half-right-staggered.svg`.
+
+### The ragged outer edge — an open decision
+
+Splitting a row-staggered 104 leaves keys that have no column to belong to,
+because the number row and the alpha rows are cut half a unit apart.
+
+- **Left half:** `6` and `F6` end up alone in a 2-key column. `6` sits at x=6.0,
+  `T` at x=5.5, `Y` at x=6.5 — so `6` is *between* T and Y, and falls left of
+  the cut with no alpha beneath it.
+- **Right half:** worse. Six clean columns, then an outer pinky column holding
+  Bksp / `]` / Enter, and **`\` alone in an eighth column**.
+
+Three ways to resolve it, undecided:
+
+1. **Keep it.** Authentic to touch-typing — `6` really is a left-index stretch.
+2. **Move `6`/`F6` right**, aligned above `Y`. Left becomes a clean 6 columns at
+   34 keys, right goes to 41.
+3. **Duplicate `6` on both halves.** What the ErgoDox does. Costs one key, ends
+   the argument.
+
+`\` has no equivalent escape — it either gets its own outer column, moves onto
+a layer, or takes a thumb slot.
+
 ### Tenting
 
 Tenting hardware is a CAD/case job and comes after the PCB — but the **mounting