[codex] surface rollout budget exhaustion (#29715)

## Summary
- surface shared rollout-budget exhaustion as
`CodexErr::RolloutBudgetExceeded` instead of a generic interrupted turn
- map it through the existing `CodexErrorInfo` and app-server v2
`codexErrorInfo` path
- keep local compaction from retrying after the shared rollout budget is
exhausted

This gives app-server clients a stable `rolloutBudgetExceeded` error
they can classify without guessing from `status="interrupted"`.

## Tests
- `just test -p codex-core rollout_budget`

codex-rs/app-server-protocol/src/protocol/v2/shared.rs

@@ -70,6 +70,7 @@ pub enum NonSteerableTurnKind {
 #[ts(export_to = "v2/")]
 pub enum CodexErrorInfo {
     ContextWindowExceeded,
+    RolloutBudgetExceeded,
     UsageLimitExceeded,
     ServerOverloaded,
     CyberPolicy,
@@ -115,6 +116,7 @@ impl From<CoreCodexErrorInfo> for CodexErrorInfo {
     fn from(value: CoreCodexErrorInfo) -> Self {
         match value {
             CoreCodexErrorInfo::ContextWindowExceeded => CodexErrorInfo::ContextWindowExceeded,
+            CoreCodexErrorInfo::RolloutBudgetExceeded => CodexErrorInfo::RolloutBudgetExceeded,
             CoreCodexErrorInfo::UsageLimitExceeded => CodexErrorInfo::UsageLimitExceeded,
             CoreCodexErrorInfo::ServerOverloaded => CodexErrorInfo::ServerOverloaded,
             CoreCodexErrorInfo::CyberPolicy => CodexErrorInfo::CyberPolicy,