Add model settings for GPT-5.4 Mini and GPT-5.4 Nano#5167
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Litellm's pricing JSON (aider's upstream source via ModelInfoManager)
ships entries for gpt-5.4-mini, gpt-5.4-mini-2026-03-17, gpt-5.4-nano,
and gpt-5.4-nano-2026-03-17. Aider was missing the project-side settings
(edit_format, weak_model_name, accepts_settings, use_temperature), so
defaults applied even though the 5.4 family expects diff edit format and
reasoning_effort support like its larger siblings.
Mirrors the existing gpt-5-mini / gpt-5-nano block exactly — same
edit_format ("diff"), repo map enabled, reasoning_effort accepted, and
no temperature. Mini entries route to gpt-5-nano for weak/editor model
duties; pinned-date entries route to the pinned nano variant.
Also adds a HISTORY.md entry under the main branch section.
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Summary
Adds entries to `aider/resources/model-settings.yml` for the GPT-5.4 Mini and GPT-5.4 Nano model variants:
These models exist in litellm's pricing JSON (aider's upstream source for model metadata via `ModelInfoManager.MODEL_INFO_URL`) but were missing the project-side settings. Without them, aider falls back to defaults that don't match the 5.x family conventions (`edit_format: diff`, repo map enabled, `reasoning_effort` accepted, no temperature).
Settings shape
Mirrors the existing `gpt-5-mini` / `gpt-5-nano` block exactly. Mini entries route to `gpt-5-nano` for weak/editor model duties; pinned-date variants route to the pinned nano variant.
Test plan