feat(renderers): add typewriter_delay parameter to AnsiRenderer

[Copilot]

AnsiRenderer had no native way to produce a typewriter effect — developers had to subclass or proxy stdout, touching every consumer. This adds a first-class typewriter_delay parameter that centralises the behaviour at the renderer level.

Changes

• AnsiRenderer.__init__ — new typewriter_delay: float = 0.0 keyword argument, stored as self._typewriter_delay
• _write_with_delay(text) — new internal helper; when delay > 0.0 writes characters one-by-one, flushing and sleeping typewriter_delay seconds after each printable non-whitespace character; when delay == 0.0 writes the whole string in a single call (zero overhead)
• _handle_token — delegates to _write_with_delay
• _handle_reasoning — writes surrounding ANSI escape codes directly, passes only the content text through _write_with_delay so colour codes are never delayed
• Only TOKEN and REASONING events are affected; all other output (tools, separators, completions) runs at full speed

Usage

# Default — no effect, no overhead
renderer = AnsiRenderer()

# Smooth typewriter output at ~8 ms per character
renderer = AnsiRenderer(typewriter_delay=0.008)

Warning

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I tried to connect to the following addresses, but was blocked by firewall rules:

• astral.sh
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If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

[galuszkm]

lgtm