Plainer wording in the CAIL Pi guide

[szweibel]

Wording-only revision of /docs/cail-pi, following the plain-writing guidance. Commands, steps and section structure are unchanged.

• Sign in: "Working on another computer over SSH?" and "Prefer an API key?" become plain "If…" and "To use…" sentences. The "no default model" note now says the message can be ignored.
• Install: "type n, because you'll run the next command in the terminal" replaces the "in the terminal, not inside Pi" contrast.
• Before you start: the colon list becomes a sentence.
• Add web search: "If you already have them, skip this step" moves ahead of the commands.
• What it is: says the Windows setting makes Pi run commands in PowerShell.
• Troubleshooting: says Pi runs full screen by default, and "For most problems, start by typing /cail" replaces two short sentences.
• Privacy: the key-replacement sentences are combined.

bun run check passes locally, and a prose-lint pass on the page text returned no findings.

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