A 9P look keeps its leading blanks: an indented line, or blanks alone, is looked for as written

Every line written to look or exec went through Messages.next, which
trimmed blanks from both ends. A look of `    indented` then found the
first bare `indented`, and a diff's blank context line ` ` looked at
nothing. A look's line is now its text: only its `\r` and newline go.
lookAt keeps the blanks for the word search too; it expands `~` only for
a look that starts with one, and the path, address and command readings
trim for themselves as before. runSearch keeps a pattern's blanks, since
a builtin's argument comes trimmed already. An exec line is trimmed as
before. fs.md says so.

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

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