[heydryft]

Summary

Adds Runcrate as a built-in provider preset for Claude and Codex in the TUI provider form, next to the other built-in presets. Runcrate serves open-weight models (Kimi, DeepSeek, GLM, Qwen, gpt-oss) and exposes both the Anthropic Messages API and the OpenAI Responses API, so one key works in both apps.

• provider_preset_builtin.rs: new BuiltinProviderPresetId::Runcrate.
  • Claude: ANTHROPIC_BASE_URL=https://api.runcrate.ai, ANTHROPIC_AUTH_TOKEN, main and Sonnet model moonshotai/Kimi-K2.6, Haiku deepseek-ai/DeepSeek-V4.1-Flash, Opus zai-org/GLM-5.3.
  • Codex: base_url = "https://api.runcrate.ai/v1", wire_api = "responses", apiFormat: openai_responses, model moonshotai/Kimi-K2.6, plus a three-model catalog with context windows and input modalities.
• cli/tui/form/provider_templates.rs: Runcrate appended to the Claude and Codex built-in template lists (after OpenRouter, so built-ins still come after partner presets).
• cli/tui/form/tests.rs: label lists, the Claude and Codex preset field tables, and the "last template" assertion updated.
• CHANGELOG.md and docs/CHANGELOG.md: entry under Unreleased.

Verification

• cargo fmt --check: clean.
• cargo test --lib cli::tui::form: 250 passed.
• cargo test --lib proxy::providers::codex: 64 passed.
• cargo test --lib provider_preset: 11 passed.
• The full cargo test --lib timed out on my machine in the proxy service tests, both with and without this change, so I ran the targeted modules above instead. cargo clippy --lib stops on an existing empty range error in src/cli/tui/ui/home_chart.rs; it reports nothing in the files this PR touches.
• Live, with a real Runcrate key: a streaming POST https://api.runcrate.ai/v1/messages with Authorization: Bearer and a tool definition (deepseek-ai/DeepSeek-V4.1-Flash) returned HTTP 200 with message_start, thinking_delta, a tool_use block, input_json_delta and message_stop events. A streaming POST /v1/responses returned HTTP 200. A non-streaming /v1/messages call with moonshotai/Kimi-K2.6 replied ok.

This PR was prepared with AI assistance.