[raghubetina]

pp chat.messages, and IRB's echo of chat.messages, garbled the separators:

[{
       role: "system",
    content: "You are helpful"
},{
       role: "user",
    content: "Draw a picture of a kitten"
}{
        role: "assistant",
...
} , ]

AI::Message#pretty_print writes directly to q.output so that IRB's ColorPrinter can't re-colorize (and escape) amazing_print's ANSI codes. Inside an Array, PP is still holding [ and the , separators in its buffer, so each message's direct write lands ahead of them. q.flush first emits what PP has buffered, so the output becomes:

[{
       role: "system",
    content: "You are helpful"
}, {
       role: "user",
    content: "Draw a picture of a kitten"
}]

This matches p chat.messages. AI::Items#pretty_print had the same direct write and gets the same fix.

Specs

Until now the formatting specs only checked that inspect returns a String. This adds exact-layout specs for:

• Chat#inspect: a new chat, and a proxy-mode chat with messages (the output the AI::Chat Examples lesson shows verbatim).
• pp of an Array of messages, and of an Array of Items.

With the lib/ change reverted, exactly the two Array specs fail. The output is identical on Ruby 3.3.11 and 4.0.1: amazing_print 2.0 prints role: style keys on both.

Testing

• rspec spec/unit: 101 examples, 0 failures on Ruby 3.3.11 and 4.0.1.
• IRB echo of a.messages with --nocolorize and with colors forced on: separators correct, ANSI codes kept and not escaped.
• standardrb clean.

Follow-up worth considering, not in this PR: in Chat#inspect, the closing ] of @messages prints at column 0 instead of under @messages. The new spec pins that layout as it is today, so fixing it later means updating the spec.