Make multi_agent_v2 wait_agent timeouts configurable (#22528)

## Why

`multi_agent_v2` already allowed configuring the minimum `wait_agent`
timeout, but the default timeout and upper bound were still hard-coded.
That made it hard to tune waits for subagent mailbox activity in
sessions that need either faster wakeups or longer waits, and it meant
the model-visible `wait_agent` schema could not fully reflect the
resolved runtime limits.

## What Changed

- Added `features.multi_agent_v2.max_wait_timeout_ms` and
`features.multi_agent_v2.default_wait_timeout_ms` alongside the existing
`min_wait_timeout_ms` setting.
- Validated all three timeouts in config as `0..=3_600_000`, with
`min_wait_timeout_ms <= default_wait_timeout_ms <= max_wait_timeout_ms`.
- Thread and review session tool config now passes the resolved
min/default/max values into the `wait_agent` tool schema.
- `wait_agent` now uses the configured default when `timeout_ms` is
omitted and rejects explicit values outside the configured min/max range
instead of silently clamping them.
- Updated the generated config schema and config-lock test coverage for
the new fields.

codex-rs/features/src/tests.rs

@@ -482,6 +482,8 @@ fn multi_agent_v2_feature_config_deserializes_table() {
 enabled = true
 max_concurrent_threads_per_session = 4
 min_wait_timeout_ms = 2500
+max_wait_timeout_ms = 120000
+default_wait_timeout_ms = 30000
 usage_hint_enabled = false
 usage_hint_text = "Custom delegation guidance."
 root_agent_usage_hint_text = "Root guidance."
@@ -502,6 +504,8 @@ non_code_mode_only = true
             enabled: Some(true),
             max_concurrent_threads_per_session: Some(4),
             min_wait_timeout_ms: Some(2500),
+            max_wait_timeout_ms: Some(120000),
+            default_wait_timeout_ms: Some(30000),
             usage_hint_enabled: Some(false),
             usage_hint_text: Some("Custom delegation guidance.".to_string()),
             root_agent_usage_hint_text: Some("Root guidance.".to_string()),
@@ -538,6 +542,8 @@ usage_hint_enabled = false
             enabled: None,
             max_concurrent_threads_per_session: None,
             min_wait_timeout_ms: None,
+            max_wait_timeout_ms: None,
+            default_wait_timeout_ms: None,
             usage_hint_enabled: Some(false),
             usage_hint_text: None,
             root_agent_usage_hint_text: None,