feat(monitor): configurable post-execution pipeline timeout (default 15m)

internal/config/config.go

@@ -168,6 +168,11 @@ type MonitorConfig struct {
 	PollIntervalMs         int `yaml:"poll_interval_ms"`
 	StuckThresholdS        int `yaml:"stuck_threshold_s"`
 	ContextFreshnessTokens int `yaml:"context_freshness_tokens"`
+	// PipelineTimeoutS bounds the whole post-execution pipeline (review + QA +
+	// merge/conflict-resolution) per story. Slow local LLM calls plus rebase-
+	// conflict resolution under concurrent builds can exceed a tight limit and
+	// trip "context deadline exceeded". Default 900s.
+	PipelineTimeoutS int `yaml:"pipeline_timeout_s"`
 }
 
 // ControllerConfig configures the periodic active controller.

internal/config/loader.go

@@ -55,6 +55,7 @@ func DefaultConfig() Config {
 			PollIntervalMs:         10000,
 			StuckThresholdS:        120,
 			ContextFreshnessTokens: 150000,
+			PipelineTimeoutS:       900, // 15 min — room for slow local LLM calls + conflict resolution
 		},
 		Cleanup: CleanupConfig{
 			WorktreePrune:          "immediate",

internal/engine/monitor.go

@@ -387,9 +387,14 @@ func (m *Monitor) postExecutionPipeline(ctx context.Context, ag ActiveAgent, rep
 	// would mark the story DB as devdb.OutcomeFailed and pollute metrics.
 	parentCtx := ctx
 
-	// Wrap context with a 5-minute timeout to prevent pipeline LLM calls
-	// (review, QA, conflict resolution) from blocking indefinitely.
-	pipelineCtx, pipelineCancel := context.WithTimeout(ctx, 5*time.Minute)
+	// Bound the post-execution pipeline (review, QA, conflict resolution).
+	// Configurable because slow local LLM calls + conflict resolution under
+	// concurrent builds can exceed a tight limit. Falls back to 15m when unset.
+	pipelineTimeout := time.Duration(m.config.Monitor.PipelineTimeoutS) * time.Second
+	if pipelineTimeout <= 0 {
+		pipelineTimeout = 15 * time.Minute
+	}
+	pipelineCtx, pipelineCancel := context.WithTimeout(ctx, pipelineTimeout)
 	defer pipelineCancel()
 	ctx = pipelineCtx
 

nxd.config.example.yaml

@@ -53,6 +53,7 @@ monitor:
     poll_interval_ms: 10000
     stuck_threshold_s: 120
     context_freshness_tokens: 150000
+    pipeline_timeout_s: 900
 cleanup:
     worktree_prune: immediate
     branch_retention_days: 7