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/tools/workflow.rs

@@ -14,10 +14,7 @@ use crate::tools::{arg_str, Tool, ToolCtx};
 use crate::workflow::engine::execution::execute_workflow;
 use crate::workflow::hive_mind::cycle::execute_cycle;
 use crate::workflow::hive_mind::synthesis::synthesize_consensus;
-use crate::workflow::hive_mind::types::{
-    CognitiveCycle, NodeDirective, NodeOutput,
-};
-use crate::workflow::script::WorkflowScript;
+use zesdex_domain::workflow::{CognitiveCycle, NodeDirective, NodeOutput, WorkflowScript};
 
 /// Execute a multi-step workflow defined in YAML.
 ///
@@ -49,7 +46,7 @@ impl Tool for WorkflowRun {
     #[instrument(skip(self, ctx, args))]
     fn run(&self, ctx: &ToolCtx, args: &Value) -> Result<String> {
         let yaml = arg_str(args, "workflow_yaml")?;
-        let script = WorkflowScript::parse(&yaml)?;
+        let script = crate::workflow::script::parse_workflow_script(&yaml)?;
         info!(
             "Workflow started: {} ({} phases)",
             script.name,