Sneaked in a few last minute bug fixes for table mode.

docs/user.txt

@@ -120,9 +120,34 @@ on desktop or Fenrir+Y on laptop. The startup selection is reading.mode.
 
 In table mode, word navigation moves between cells, line start/end moves
 to the first/last cell, and first/last text moves to the first/last
-character in the current cell. Place review on a header row and press
-Fenrir+X to use its cells as column headers. Outside table mode,
-Fenrir+X places a text-selection mark.
+character in the current cell. Fenrir uses visible headings
+automatically when a text heading is followed by a row with at least two
+numeric fields. You can enter table mode, run free -h, and review its
+cells without setting headers yourself. Aligned tables use shared column
+boundaries so an unnamed heading or an empty field does not shift the
+remaining columns. Multiword headings and values stay in their cells
+when the visible alignment distinguishes them.
+
+When you begin reviewing a recognized table at or immediately above the
+application cursor, review starts at the first cell of its first data
+row. For example, after free -h, current word reads Mem: and next word
+reads the total memory value. The application cursor stays in place.
+Existing review positions are preserved while output updates; manual
+headers or clearing headers disable this automatic starting position.
+
+Automatic headers are inferred from the visible output block being
+reviewed; they are not remembered after the heading scrolls off screen.
+Text-only tables, wrapped output, and ambiguous or grouped headings may
+require manual selection. Place review on the desired header row and
+press Fenrir+X to replace the automatic headers. For grouped headings,
+select the row naming individual columns. Manual headers remain until
+cleared, table mode is left, or the screen session changes.
+
+Press Fenrir+Control+Shift+X to clear headers and use generic column
+numbers. Automatic header assignment stays off until you leave and
+re-enter table mode or the screen session changes; Fenrir+X can still
+set headers manually. Outside table mode, Fenrir+X places a
+text-selection mark instead.
 
 Speech and automatic reading