Move text editing out of pardes.zig into edit.zig

Pure move, no behaviour change (acme keeps this in text.c): which text a
pane edits and how it maps to the screen (editText, editTextEol,
setEditText, paneCursorLines, paneByteAtDisplay, pinPaneCursor,
flatSurface, paneWrapWidth), insert mode (enterInsert, handleInsert,
insertKey, insertTab, exitInsert, clampFileCursor), the d/c/y/p edit
operations with replace, case, join, indent, comment, number, textobjects
and surround, undo and redo, yank/clipboard/paste (setYank, setClipboard,
ClipRequest, clipRequest, typeToTty, applyPaste, clipYank), and the pointer
selections as text (PointerTextSelection, pointerTextSelection,
capturePointerSelection, paneText, pointerSourceLine, selectionText,
spanHas, currentSelText), with four tests, go verbatim to edit.zig.

The methods become free functions taking `p: *Pardes`; calls change from
`p.insertKey(..)` to `edit.insertKey(p, ..)` (pardes.zig, body_layer.zig,
selection_pipe.zig, builtins.zig, test/hxdiff.zig, test/perf.zig). In
executeNormalAction the `.edit => |edit|` capture becomes `|op|`, since it
would now shadow the edit import. test/lspbench.zig's first anchor follows
its needle into src/edit.zig.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

0 files changed, 0 insertions, 0 deletions