fix(onboarding): accept CLI providers without a model

[Alex Shabalin (alex-sparus)]

Empty model means "use the CLI default" for claude/codex/opencode, but step readiness required a non-empty evolveModel, so saving a CLI provider silently kept the flow on the inference step.

Summary

Onboarding was stuck if Codex CLI was selected without a model name (which means "use default", as the UI displayed)

Test Plan

• Onboarding passes with Codex CLI and empty model name

Docs

• Docs updated (companion PR in darkmatter/nixmac-web: #___)
• No docs update needed

[github-actions]

	Warnings
⚠️	No Linear issue ID found in this PR's title, description, or branch name (expected something like ENG-123). Add one so this work is traceable in Linear, or add #no-linear to the PR description to acknowledge it's intentionally untracked.

📋 PR Overview

Lines changed	47 (+44 / -3)
Files	0 added, 5 modified, 0 deleted
Draft / WIP	no
Has Test Plan	yes
Linear issue	no
No Test Plan Needed	no
New UI components	no
New Storybook stories	no
New Rust modules	no
New TS source files	no
New tests	no
package.json touched	no
Cargo.toml touched	no
Infra / CI touched	no

🔬 Coverage

Report	Lines	Statements	Functions	Branches
apps/native/coverage/coverage-summary.json	34.3%	33.9%	30.5%	28.6%

Generated by 🚫 dangerJS against 913b089

[Alex Shabalin (alex-sparus)]

I'll fix the actual issues with Codex CLI in a different PR

2026-07-08T13:41:20.345492Z  INFO nixmac::rebuild::darwin: [darwin] Logging to: "/Users/alex/Library/Logs/
nixmac/darwin-rebuild_2026-07-08_15-41-20.log"
2026-07-08T13:41:20.963441Z  WARN nixmac::ai::log_summarizer: [log_summarizer] Summarization failed: 'code
x' exited with exit status: 2: error: unexpected argument '--quiet' found

  tip: to pass '--quiet' as a value, use '-- --quiet'

Usage: codex [OPTIONS] [PROMPT]
       codex [OPTIONS] <COMMAND> [ARGS]

For more information, try '--help'.
2026-07-08T13:41:21.523701Z  WARN nixmac::ai::log_summarizer: [log_summarizer] Summarization failed: 'code

[darkmatter]

🎨 Storybook preview

Open Storybook preview

Updated for 913b089

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⚠️ Detected UI changes (5)

These stories' HTML snapshots changed. I've added screenshots + links to the changed stories below. Review them carefully then accept the changes to regenerate baselines and include them in this PR:

Widget/Controls/FlakeDirChooser › Multiple Candidates

Widget/Controls/FlakeDirChooser › Applying

Widget/Drift/DriftReview › Unsummarized

Widget/Drift/DriftReview › Summarized

Widget/Drift/DriftReview › Ai Session

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[Juanpe Bolívar (arximboldi)]

congrats on your first PR :) LGTM

[Alex Shabalin (alex-sparus)]

I think it's almost a duplicate of #492
I'll continue working on the CLI providers because it's really buggy right now 😅