parity: independent Ultracode toggle and legacy effort normalization (CO-TRAITS, TV-LINEAGE) #296

Upstream pingdotgg/t3code#27034 changes CO-TRAITS / TV-LINEAGE. Existing owners #245 / #243.

CO-TRAITS / TV-LINEAGE: Ultracode is now an independent Boolean descriptor usable with any effort. Legacy effort=ultracode normalizes to effort=xhigh plus ultracode=true only when the new Boolean exists, preserving explicit false; old servers retain legacy choice. Composer footer/trigger and workflow/subagent metadata expose the independent state. Native traits.rs resolve_descriptors/explicit_selections currently has no such migration; follow-up required under #245/#243. No actual provider turns authorized.

Required proof when selected: meaningful failing-first legacy normalization/explicit false and independent effort+Ultracode cases, typed descriptor behavior across old/new servers, and before/after composer/workflow display evidence. Current native typed Boolean descriptors already tolerate the additive option; this is a feature/normalization gap, not a schema decode failure. Existing accepted sidebar rows remain unchanged. This tracking issue grants no provider turns or wider runtime access.

Watched production sources:

• apps/web/src/components/chat/ComposerModelEffort.tsx
• apps/web/src/components/chat/EffortGlyph.tsx
• apps/web/src/components/chat/SubagentTooltipContent.tsx
• apps/web/src/components/chat/ThreadLineageWorkflowRow.tsx
• apps/web/src/components/chat/WorkflowOpeningBlock.tsx
• packages/client-runtime/src/modelTraits.ts
• packages/client-runtime/src/state/subagentDisplay.ts
• packages/client-runtime/src/state/subagentRuntime.ts
• packages/client-runtime/src/state/threadExecution.ts

Digest #295; source-only triage. GPT-6.1 Sol / Codex, batch 56.