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/config.schema.json

@@ -29,12 +29,24 @@
         "$ref": "#/definitions/AgentRoleToml"
       },
       "properties": {
+        "job_max_runtime_seconds": {
+          "description": "Default maximum runtime in seconds for agent job workers.",
+          "format": "uint64",
+          "minimum": 1.0,
+          "type": "integer"
+        },
         "max_depth": {
           "description": "Maximum nesting depth allowed for spawned agent threads. Root sessions start at depth 0.",
           "format": "int32",
           "minimum": 1.0,
           "type": "integer"
         },
+        "max_spawn_depth": {
+          "description": "Maximum depth for thread-spawned subagents.",
+          "format": "uint",
+          "minimum": 1.0,
+          "type": "integer"
+        },
         "max_threads": {
           "description": "Maximum number of agent threads that can be open concurrently. When unset, no limit is enforced.",
           "format": "uint",
@@ -2040,6 +2052,14 @@
       ],
       "description": "User-level skill config entries keyed by SKILL.md path."
     },
+    "sqlite_home": {
+      "allOf": [
+        {
+          "$ref": "#/definitions/AbsolutePathBuf"
+        }
+      ],
+      "description": "Directory where Codex stores the SQLite state DB. Defaults to `$CODEX_SQLITE_HOME` when set. Otherwise uses a temp dir under WorkspaceWrite sandboxing and `$CODEX_HOME` for other modes."
+    },
     "suppress_unstable_features_warning": {
       "description": "Suppress warnings about unstable (under development) features.",
       "type": "boolean"