Agent jobs (spawn_agents_on_csv) + progress UI (#10935)

## Summary
- Add agent job support: spawn a batch of sub-agents from CSV, auto-run,
auto-export, and store results in SQLite.
- Simplify workflow: remove run/resume/get-status/export tools; spawn is
deterministic and completes in one call.
- Improve exec UX: stable, single-line progress bar with ETA; suppress
sub-agent chatter in exec.

## Why
Enables map-reduce style workflows over arbitrarily large repos using
the existing Codex orchestrator. This addresses review feedback about
overly complex job controls and non-deterministic monitoring.

## Demo (progress bar)
```
./codex-rs/target/debug/codex exec \
  --enable collab \
  --enable sqlite \
  --full-auto \
  --progress-cursor \
  -c agents.max_threads=16 \
  -C /Users/daveaitel/code/codex \
  - <<'PROMPT'
Create /tmp/agent_job_progress_demo.csv with columns: path,area and 30 rows:
path = item-01..item-30, area = test.

Then call spawn_agents_on_csv with:
- csv_path: /tmp/agent_job_progress_demo.csv
- instruction: "Run `python - <<'PY'` to sleep a random 0.3–1.2s, then output JSON with keys: path, score (int). Set score = 1."
- output_csv_path: /tmp/agent_job_progress_demo_out.csv
PROMPT
```

## Review feedback addressed
- Auto-start jobs on spawn; removed run/resume/status/export tools.
- Auto-export on success.
- More descriptive tool spec + clearer prompts.
- Avoid deadlocks on spawn failure; pending/running handled safely.
- Progress bar no longer scrolls; stable single-line redraw.

## Tests
- `cd codex-rs && cargo test -p codex-exec`
- `cd codex-rs && cargo build -p codex-cli`

codex-rs/core/src/codex.rs

@@ -640,6 +640,7 @@ impl TurnContext {
             model_info: &model_info,
             features: &features,
             web_search_mode: self.tools_config.web_search_mode,
+            session_source: self.session_source.clone(),
         })
         .with_allow_login_shell(self.tools_config.allow_login_shell)
         .with_agent_roles(config.agent_roles.clone());
@@ -975,6 +976,7 @@ impl Session {
             model_info: &model_info,
             features: &per_turn_config.features,
             web_search_mode: Some(per_turn_config.web_search_mode.value()),
+            session_source: session_source.clone(),
         })
         .with_allow_login_shell(per_turn_config.permissions.allow_login_shell)
         .with_agent_roles(per_turn_config.agent_roles.clone());
@@ -4592,6 +4594,7 @@ async fn spawn_review_thread(
         model_info: &review_model_info,
         features: &review_features,
         web_search_mode: Some(review_web_search_mode),
+        session_source: parent_turn_context.session_source.clone(),
     })
     .with_allow_login_shell(config.permissions.allow_login_shell)
     .with_agent_roles(config.agent_roles.clone());
@@ -9267,6 +9270,7 @@ mod tests {
                     })
                     .to_string(),
                 },
+                source: ToolCallSource::Direct,
             })
             .await;
 
@@ -9306,6 +9310,7 @@ mod tests {
                     })
                     .to_string(),
                 },
+                source: ToolCallSource::Direct,
             })
             .await;
 
@@ -9365,6 +9370,7 @@ mod tests {
                     })
                     .to_string(),
                 },
+                source: ToolCallSource::Direct,
             })
             .await;