Publish harness and TUI open-source

initial sync from the monorepo

crates/codegen/xai-grok-telemetry/src/prompt_timing.rs

@@ -0,0 +1,57 @@
+//! Per-turn prompt latency measurement.
+//!
+//! Extracted from `xai-grok-shell::session::prompt_timing`.
+
+use std::time::Instant;
+
+use crate::events::PromptLatency;
+use crate::session_ctx::log_event;
+
+pub use crate::enums::McpInitStrategy;
+
+pub struct PromptTiming {
+    turn_start: Instant,
+    mcp_wait_ms: u64,
+    tool_collection_ms: u64,
+}
+
+impl PromptTiming {
+    pub fn start() -> Self {
+        Self {
+            turn_start: Instant::now(),
+            mcp_wait_ms: 0,
+            tool_collection_ms: 0,
+        }
+    }
+
+    pub fn record_tool_prep(&mut self, mcp_wait_ms: u64, total_prep_ms: u64) {
+        self.mcp_wait_ms = mcp_wait_ms;
+        self.tool_collection_ms = total_prep_ms.saturating_sub(mcp_wait_ms);
+    }
+
+    pub fn emit(
+        self,
+        model_call_ms: u64,
+        turn_index: u32,
+        mcp_server_count: u32,
+        mcp_tools_registered: u32,
+        mcp_strategy: McpInitStrategy,
+        model_id: String,
+    ) {
+        let total_ms = self.turn_start.elapsed().as_millis() as u64;
+        let pre_model_ms = total_ms.saturating_sub(model_call_ms);
+
+        log_event(PromptLatency {
+            turn_index,
+            total_ms,
+            mcp_wait_ms: self.mcp_wait_ms,
+            tool_collection_ms: self.tool_collection_ms,
+            model_call_ms,
+            pre_model_ms,
+            mcp_server_count,
+            mcp_tools_registered,
+            mcp_strategy,
+            model_id,
+        });
+    }
+}