feat(graph): support max_concurrent_jobs at the graph level

Graph agents could only inherit the app-wide job budget; the agent-level
header in graph.yaml now accepts max_concurrent_jobs alongside
model/temperature, flowing through AgentConfig::from_graph into the
run-wide supervisor. Deliberately graph-wide, not per-node: jobs outlive
the node that started them.

src/config/agent.rs

@@ -854,6 +854,7 @@ impl AgentConfig {
             variables: graph.variables.clone(),
             can_spawn_agents: graph.has_agent_node(),
             max_concurrent_agents: default_max_concurrent_agents(),
+            max_concurrent_jobs: graph.max_concurrent_jobs,
             max_agent_depth: default_max_agent_depth(),
             escalation_timeout: default_escalation_timeout(),
             ..AgentConfig::default()
@@ -1328,6 +1329,7 @@ variables:
             model: claude:claude-sonnet-4-6
             temperature: 0.3
             top_p: 0.8
+            max_concurrent_jobs: 2
             global_tools:
               - fetch_pdf.sh
             mcp_servers:
@@ -1350,6 +1352,7 @@ variables:
         assert_eq!(config.model_id.as_deref(), Some("claude:claude-sonnet-4-6"));
         assert_eq!(config.temperature, Some(0.3));
         assert_eq!(config.top_p, Some(0.8));
+        assert_eq!(config.max_concurrent_jobs, Some(2));
         assert_eq!(config.global_tools, vec!["fetch_pdf.sh"]);
         assert_eq!(config.mcp_servers, vec!["pubmed-search"]);
         assert_eq!(config.conversation_starters, vec!["Start here"]);

src/graph/types.rs

@@ -28,6 +28,9 @@ pub struct Graph {
     #[serde(default, skip_serializing_if = "Option::is_none")]
     pub reasoning_effort: Option<String>,
 
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub max_concurrent_jobs: Option<usize>,
+
     #[serde(default)]
     pub global_tools: Vec<String>,
 
@@ -895,6 +898,7 @@ nodes:
         assert!(graph.model.is_none());
         assert!(graph.temperature.is_none());
         assert!(graph.top_p.is_none());
+        assert!(graph.max_concurrent_jobs.is_none());
         assert!(graph.global_tools.is_empty());
         assert!(graph.mcp_servers.is_empty());
         assert!(graph.conversation_starters.is_empty());

src/graph/validator.rs

@@ -998,6 +998,7 @@ mod tests {
             temperature: None,
             top_p: None,
             reasoning_effort: None,
+            max_concurrent_jobs: None,
             global_tools: Vec::new(),
             mcp_servers: Vec::new(),
             skills_enabled: None,