feat(mobile): force efficient model as the dev default

[iscekic]

Summary

• In development builds, always select kilo-auto/efficient for a new mobile session.
• The dev default wins over the server preference, the local preference, and the organization default.
• Release builds keep the current selection priority.
• Add pure unit coverage for the full selection priority.

Why

Development sessions need one stable efficient model. A stale preference from an earlier
session must not change the dev default. Release builds must not change at all.

How

• Extract the selection priority into a pure function, pickAutoSelectedModel.
• Return kilo-auto/efficient first when __DEV__ is true and the catalog holds the model.
• If the catalog does not hold the model, fall back to the release priority: server
  lastSelected, then the local persisted preference, then the organization default, then
  the first catalog entry.
• Keep the existing hook loading gate and selection latch.

Verification

• pnpm test from apps/mobile — passed, 330 files and 3041 tests.
• pnpm typecheck from apps/mobile — passed.
• pnpm lint from apps/mobile — passed.

E2E

Bot E2E verification uses an iOS development build and checks the fresh new-session picker.

Visual Changes

N/A — this change alters the selected model, not the picker layout.

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Executive Summary

Incrementally re-reviewed the follow-up commits that promote the dev-only kilo-auto/efficient default above every explicit override: the change matches the stated PR intent, the release-build priority is behavior-identical, the early return skips no side effects (all helpers are pure), the updated and new unit tests trace correctly against the implementation, and no memory leaks or breaking changes were introduced.

Files Reviewed (3 files)

• apps/mobile/src/lib/hooks/auto-select-model.ts
• apps/mobile/src/lib/hooks/auto-select-model.test.ts
• apps/mobile/src/lib/hooks/use-auto-select-model.ts

Previous Review Summary (commit e0c26cf)

Current summary above is authoritative. Previous snapshots are kept for context only.

Previous review (commit e0c26cf)

Status: No Issues Found | Recommendation: Merge

Executive Summary

Reviewed the dev-only kilo-auto/efficient auto-selection fallback for mobile new sessions: the selection-priority extraction into pickAutoSelectedModel is behavior-preserving for release builds, the __DEV__ gate follows existing codebase patterns, the 11 new unit tests trace correctly against the implementation, and no memory leaks or breaking changes were introduced.

Files Reviewed (3 files)

• apps/mobile/src/lib/hooks/auto-select-model.ts
• apps/mobile/src/lib/hooks/auto-select-model.test.ts
• apps/mobile/src/lib/hooks/use-auto-select-model.ts

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_{Reviewed by kimi-k3 · Input: 119.9K · Output: 5.7K · Cached: 182.3K}

_{Review guidance: REVIEW.md from base branch main}