fix(rust): remove unused imports, variables, and dead code causing CI build failures

- Remove unused imports: AtomicBool, Future (provider.rs), debug (executor.rs)
- Remove unused import WorkflowScript (workflow.rs)
- Remove unused variables: tool_name, t_ctx, t_args (executor.rs)
- Remove dead variable class_indent (semantic_search.rs)

CI was failing with 'error: could not compile zesdex-infrastructure
due to 10 previous errors' caused by -D warnings treating unused
code as compilation errors.

apps/infrastructure/src/tools/executor.rs

@@ -2,7 +2,6 @@ use std::future::Future;
 use anyhow::Result;
 use zesdex_application::agent::ToolExecutor;
 use crate::tools::{all_tools, Tool, ToolCtx};
-use tracing::debug;
 
 pub struct InfrastructureToolExecutor {
     ctx: ToolCtx,
@@ -32,17 +31,6 @@ impl ToolExecutor for InfrastructureToolExecutor {
         async move {
             match tool_opt {
                 Some(tool) => {
-                    // Tool::run is synchronous, so we run it in a blocking task if needed
-                    // For now, since they run fast and we are transitioning, we can just block in place.
-                    // Or tokio::task::spawn_blocking:
-                    let tool_name = tool.name().to_string();
-                    let t_ctx = ctx.clone();
-                    let t_args = args.clone();
-                    
-                    // Because Tool isn't easily cloned, we might just block on the current thread, 
-                    // or use tokio::task::block_in_place if we're in a tokio runtime.
-                    // But `tool.run` takes `&self`, and we have `&self` borrowed.
-                    // For now we just call it directly.
                     tokio::task::block_in_place(move || {
                         tool.run(&ctx, &args)
                     })