Desktop reasoning effort now follows the selected session runtime instead of the General settings surface. Session metadata records provider, model, and effort so reconnects and prewarm restarts preserve the per-session runtime, while the default effort is max for new sessions.
Constraint: Existing transcript and localStorage runtime data must remain readable without a required migration.
Rejected: Keep effort as a General setting | it made one session change leak into every other session.
Confidence: high
Scope-risk: moderate
Directive: Do not reintroduce global desktop effort controls without proving multi-session isolation.
Tested: bun run check:server
Tested: bun run check:desktop
Tested: bun run check:native
Tested: bun run check:policy
Tested: bun run check:coverage
Tested: cd desktop && bun run test -- src/components/controls/ModelSelector.test.tsx src/stores/chatStore.test.ts
Tested: bun test src/server/__tests__/settings.test.ts --test-name-pattern "effort"
Tested: bun test src/server/__tests__/conversations.test.ts --test-name-pattern "runtime"
Not-tested: Live provider smoke for domestic providers without local credentials.
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