C-j fix; tool doc upd

README.md

@@ -166,12 +166,12 @@ When enabled, the interactive console uses a subtle ANSI palette: the pending-re
 #### `write_file` tool
 
 - Parameters:
-  - `path` (string, required): JSON-escaped file path to write to (must be created unless existing).
+  - `path` (string, required): JSON-escaped file path to write to.
-  - `offset` (integer, optional, default 0): byte offset to start writing from (defaults to 0, start of file; does not append).
+  - `offset` (integer, optional): byte offset to start writing from. If omitted together with `del_bytes`, the whole file is overwritten instead. Defaults to 0 (start of file).
-  - `del_bytes` (integer, optional, default 0): bytes to delete starting from the `offset` prior to writing.
+  - `del_bytes` (integer, optional): bytes to delete starting at `offset`. If omitted together with `offset`, the whole file is overwritten instead.
   - `content` (string, required, may be empty): JSON-escaped content to write to the file.
 - Return value: string
-- Action: write `content` into the file at `path` starting at `offset` after deleting `del_bytes` bytes (creating the file and any necessary parent directories).
+- Action: if `offset` and `del_bytes` are both omitted, the entire file is overwritten with `content` (the file, and any necessary parent directories, are created if missing); otherwise `content` is written at `offset`, optionally deleting `del_bytes` bytes first (splicing prefix + content + suffix and never appending to the end of an existing file), creating the file and parent directories as needed.
 
 #### `shell_exec` tool
 

main.go

@@ -1598,7 +1598,10 @@ func (e *editor) draw() {
   er, _ := textPos(P, W, s, len([]rune(s)))
   pr, pc := textPos(P, W, s, e.pos)
   if e.crow > 0 { fmt.Printf("\033[%dA", e.crow) }
-  fmt.Print("\r\033[J" + e.prompt + s)
+  // In raw mode OPOST is off, so a bare \n only moves down without
+  // returning to column 0. Emit \r\n so each logical line starts at
+  // column 0, matching the column-reset assumption in textPos().
+  fmt.Print("\r\033[J" + e.prompt + strings.ReplaceAll(s, "\n", "\r\n"))
   if up := er - pr; up > 0 { fmt.Printf("\033[%dA", up) }
   fmt.Print("\r")
   if pc > 0 { fmt.Printf("\033[%dC", pc) }