Type: Character Alignment on the ICF top and bottom (ideographic character face)

Character panel menu › Character Alignment gains ICF Top/Right and ICF Bottom/Left, and
`charAlign` takes `icfTop` / `icfBottom`: a character smaller than the largest on its line lines
up its ideographic character face's top (right, vertical) or bottom (left) with the big one's.

`FontFace::icf_margins` places the ICF inside the em box as the OpenType baseline tags define it
(https://learn.microsoft.com/en-us/typography/opentype/spec/baselinetags): `icfb` / `icft` of the
BASE table's horizontal and vertical axes against `ideo` / `idtp` (else the OS/2 typographic
descender and one em), for Han ideographs (else kana, else the first script). Without them, as that
page allows, the average ink box of some ideographs and kana; a face without ideographs uses its
em box.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

docs/mcp.md

@@ -2274,6 +2274,19 @@ undo step.
 {"name":"run_command","arguments":{"command":"text.setFormat","params":{"burasagari":"forced"}}}
 ```
 
+## Character Alignment
+
+`text.setFormat {charAlign}` (the selected type, or `ids`) and `text.setRangeStyle {id, start, end, charAlign}` (a range)
+set where characters smaller than the largest on their line line up with it: `romanBaseline` (the default), the em box's
+`emBoxTop`, `emBoxCenter` or `emBoxBottom`, or the ideographic character face's (ICF) `icfTop` or `icfBottom`. In
+vertical type top and bottom are the right and left of the column. The ICF comes from the font's BASE table (`icfb`,
+`icft`, as the OpenType baseline tags define them), else from the average ink box of some ideographs and kana; a font
+without ideographs uses its em box. One undo step.
+
+```json
+{"name":"run_command","arguments":{"command":"text.setFormat","params":{"charAlign":"icfTop"}}}
+```
+
 ## New type in a Japanese interface
 
 While the interface is in Japanese (VectorCraft › Language, or `auto` on a Japanese system), new type starts with em