document shape: diagnostics, headingless tables, plus-sigil rows and env-var columns

[sadigaxund]

A document's own shape is read before its rows are: a leading option-rejection diagnostic, a headingless table duplicated into the root description, a group label that only repeats the node's description, a +word or +/-name option row and a header-declared three-column table each reach the tree correctly now. These were five seed-7 items whose common cause was the document boundary rather than any option row, plus the three Xvfb defects and the + column placement the maintainer's round 10 visual check reported.

Round 11 additions: a +/-name expansion no longer collides with an ordinary row documenting the same spelling, so -render keeps one row with its four choices and +render keeps its own; +extension and -extension read the same name value column; the colon-introduced list of run-time-toggleable extensions becomes that placeholder's 19 choices on both halves; and a + spelling longer than one character renders in the long column beside -render instead of the short column at column 0, leaving fzf's one-character +i and +s where they belong.

Fleet sweep against the 0b30c15 baseline, 2269 tools matched, 0 appeared, 0 disappeared: 10 flags gained across 2 tools (Xvfb 69 to 77, fzf 63 to 65), 0 subcommand losses, 0 subcommand gains, 49 tools field-level. 84 flags are counted as lost across 42 tools, every one a qemu-*-static going 26 to 24: those two entities per tool are fabricated duplicates with no description and no unique spelling, verified five ways, so no spelling, description or value name is lost anywhere. Xvfb reads 77 rather than 78 because the one entity removed is the duplicate -render the collision fabricated. The S-145 widening this branch needed also recovers a value name on five further tools, each checked against that tool's own text: jdb -dbgtrace [flags], jrunscript -encoding <encoding>, llvm-libtool-darwin-18 -arch_only <arch_type>, llvm-lipo-18 -arch <value>, screen -wipe [match]. All nine named controls are byte-identical on the first capture, docker and git included.