Refactor subagent and workflow domain models; migrate access tiers and events to domain module

- Moved `AccessTier` and `SubagentEvent` enums to `zesdex_domain::subagent`.
- Consolidated workflow-related types into `zesdex_domain::workflow`.
- Updated references across the codebase to use the new domain models.
- Refactored tool execution logic to utilize a new `ToolExecutor` trait.
- Enhanced `AgentTurnService` to handle tool calls and events more effectively.
- Adjusted API handlers and state management to align with new domain structure.

apps/infrastructure/src/workflow/hive_mind/cycle.rs

@@ -15,7 +15,7 @@ use crate::subagent::context::SubagentContext;
 use crate::subagent::division::AccessTier;
 use crate::subagent::engine::run_agent;
 use crate::tools::ToolCtx;
-use crate::workflow::hive_mind::types::{CognitiveCycle, NodeOutput};
+use zesdex_domain::workflow::{CognitiveCycle, NodeOutput};
 
 /// Execute one cycle: run each node directive and collect outputs.
 ///
@@ -56,7 +56,7 @@ pub async fn execute_cycle(
 
     let cycle_index = cycle.index;
 
-    use crate::workflow::hive_mind::types::NodeDirective;
+    use zesdex_domain::workflow::NodeDirective;
 
     // Run all directives in this cycle concurrently.
     let handles: Vec<_> = cycle

apps/infrastructure/src/workflow/hive_mind/synthesis.rs

@@ -4,7 +4,7 @@ use anyhow::Result;
 use tracing::info;
 
 use crate::tools::ToolCtx;
-use crate::workflow::hive_mind::types::NodeOutput;
+use zesdex_domain::workflow::NodeOutput;
 
 /// Synthesize a consensus from all node outputs.
 ///

apps/infrastructure/src/workflow/hive_mind/types.rs

@@ -1,31 +1,3 @@
 //! Hive-mind shared types — node directives, cycle plans, and node outputs.
 
-/// A directive for a single processing node in the hive mind.
-#[derive(Debug, Clone)]
-pub struct NodeDirective {
-    pub directive: String,
-    pub access_tier: String,
-}
-
-/// A cognitive cycle plan — ordered list of cycles, each containing
-/// parallel node directives.
-#[derive(Debug, Clone)]
-pub struct CognitiveCyclePlan {
-    pub cycles: Vec<Vec<NodeDirective>>,
-}
-
-/// A single cycle in a cognitive cycle plan — parallel node directives
-/// executed together.
-#[derive(Debug, Clone)]
-pub struct CognitiveCycle {
-    pub index: u32,
-    pub directives: Vec<NodeDirective>,
-}
-
-/// Output from a single hive-mind processing node after a cycle completes.
-#[derive(Debug, Clone)]
-pub struct NodeOutput {
-    pub id: String,
-    pub directive: String,
-    pub output: String,
-}
+// Types have been moved to zesdex_domain::workflow