huskies: merge 1017

server/src/service/agents/mod.rs

@@ -6,6 +6,8 @@
 //! into `AgentPool` or the filesystem.
 //!
 //! Conventions: `docs/architecture/service-modules.md`
+/// In-memory cost rollup register — written by the cost-rollup subscriber.
+pub mod cost_rollup;
 mod io;
 /// Agent selection heuristics — pick the best agent for a story.
 pub mod selection;
@@ -215,13 +217,20 @@ pub fn get_test_results(
     io::read_test_results_from_file(project_root, story_id)
 }
 
-/// Get the aggregated token cost for a specific story.
+/// Get the aggregated token cost for a specific story from the rollup register.
+///
+/// Returns a zero-cost summary when no rollup has been recorded yet (story
+/// still in progress or no token records exist).
 pub fn get_work_item_token_cost(
     project_root: &Path,
     story_id: &str,
 ) -> Result<TokenCostSummary, Error> {
-    let records = io::read_token_records(project_root)?;
-    Ok(token::aggregate_for_story(&records, story_id))
+    Ok(cost_rollup::get_rollup(project_root, story_id)
+        .map(|r| r.as_summary())
+        .unwrap_or(TokenCostSummary {
+            total_cost_usd: 0.0,
+            agents: vec![],
+        }))
 }
 
 /// Get all token usage records across all stories.