[codex] Add Ultra reasoning effort (#29899)

## Why

Ultra should be one user-facing reasoning selection for work that
benefits from both maximum reasoning and proactive multi-agent
delegation. Without it, clients must coordinate maximum reasoning with
the experimental `multiAgentMode` setting, even though the inference
backend still expects its existing `max` effort value.

This change makes reasoning effort the source of truth: clients select
`ultra`, core derives proactive multi-agent behavior when the turn is
eligible for multi-agent V2, and inference requests continue to use the
backend-compatible `max` value.

## What changed

- Add `ultra` as a first-class reasoning effort and preserve
model-catalog ordering when exposing it to clients.
- Convert `ultra` to `max` at the inference request boundary, including
Responses HTTP/WebSocket requests, startup prewarm, compaction, and
memory summarization.
- Derive effective multi-agent mode per turn from effective reasoning
effort:
  - eligible multi-agent V2 + `ultra` → `proactive`
  - eligible multi-agent V2 + any other effort → `explicitRequestOnly`
- V1 or otherwise ineligible sessions → no multi-agent mode instruction
- Keep the derived effective mode in turn context history so successive
turns can emit a developer-message update only when the effective mode
changes.
- Remove selected multi-agent mode from core session configuration, turn
construction, thread settings, resume/fork restoration, and subagent
spawn plumbing. Subagents inherit reasoning effort and derive their own
effective mode.
- Retain the experimental app-server `multiAgentMode` fields for wire
compatibility while marking them deprecated. Request values are accepted
but ignored; compatibility response fields report `explicitRequestOnly`.
- Display Ultra in the TUI using the order supplied by `model/list`.

## Validation

- `just test -p codex-core ultra_reasoning_uses_max_for_requests`
- `just test -p codex-tui model_reasoning_selection_popup`

codex-rs/core/src/client_tests.rs

@@ -31,6 +31,7 @@ use codex_protocol::auth::AuthMode;
 use codex_protocol::models::ContentItem;
 use codex_protocol::models::ResponseItem;
 use codex_protocol::openai_models::ModelInfo;
+use codex_protocol::openai_models::ReasoningEffort;
 use codex_protocol::protocol::InternalSessionSource;
 use codex_protocol::protocol::SessionSource;
 use codex_protocol::protocol::SubAgentSource;
@@ -154,6 +155,20 @@ fn test_session_telemetry() -> SessionTelemetry {
     )
 }
 
+#[test]
+fn ultra_reasoning_uses_max_for_requests() {
+    assert_eq!(
+        (
+            super::reasoning_effort_for_request(ReasoningEffort::Ultra),
+            super::reasoning_effort_for_request(ReasoningEffort::High),
+        ),
+        (
+            ReasoningEffort::Custom("max".to_string()),
+            ReasoningEffort::High,
+        )
+    );
+}
+
 #[derive(Default)]
 struct TagCollectorVisitor {
     tags: BTreeMap<String, String>,