Track Code Mode tool call metadata completeness (#41058)

## Why

Executed-tool metadata for a Code Mode cell can span its `exec` and `wait`
outputs. Consumers need to know whether that metadata contains the cell's full
tool call inventory or only a partial record.

## What changed

- Associate recorded tool calls with the originating Code Mode cell across
  `exec` and `wait` outputs.
- Add a host-owned `tool_calls_complete` marker when recording finishes without
  dropped or truncated calls. The marker describes inventory completeness, not
  tool success.
- Preserve the cell metadata through replay and pruning, and clear the
  completeness marker when prompt budgeting makes the record incomplete.

## Testing

Add coverage for multi-wait cells, retries, interruptions, recording limits,
argument truncation, prompt budgeting, and rejection of input-forged metadata.

GitOrigin-RevId: 377014edec06aab42aadab78b8b5dccc0a1c83ba

codex-rs/core/src/session/session.rs

@@ -1428,10 +1428,11 @@ impl Session {
                         session_configuration.parent_thread_id,
                     ),
                 ),
-                executed_tool_calls,
+                executed_tool_calls: executed_tool_calls.clone(),
                 code_mode_service: crate::tools::code_mode::CodeModeService::new(
                     Arc::clone(&code_mode_session_provider),
                     &config.code_mode,
+                    executed_tool_calls,
                 ),
                 tool_search_handler_cache: Default::default(),
                 turn_environments: Arc::clone(&turn_environments),

codex-rs/core/src/session/tests.rs

@@ -6336,10 +6336,11 @@ pub(crate) async fn make_session_and_context() -> (Session, TurnContext) {
             /*attestation_provider*/ None,
             config.http_client_factory(),
         ),
-        executed_tool_calls,
+        executed_tool_calls: executed_tool_calls.clone(),
         code_mode_service: crate::tools::code_mode::CodeModeService::new(
             Arc::new(codex_code_mode::DisabledCodeModeSessionProvider),
             &config.code_mode,
+            executed_tool_calls,
         ),
         tool_search_handler_cache: Default::default(),
         turn_environments: Arc::clone(&turn_environments),
@@ -8614,10 +8615,11 @@ where
             /*attestation_provider*/ None,
             config.http_client_factory(),
         ),
-        executed_tool_calls,
+        executed_tool_calls: executed_tool_calls.clone(),
         code_mode_service: crate::tools::code_mode::CodeModeService::new(
             Arc::new(codex_code_mode::DisabledCodeModeSessionProvider),
             &config.code_mode,
+            executed_tool_calls,
         ),
         tool_search_handler_cache: Default::default(),
         turn_environments: Arc::clone(&turn_environments),