Fix insights guideline budget cap and branch-exclusion logic

- Change guideline cap from max(budget/10, 1024) to min(budget/10, 1024)
  so guidelines cannot exceed the prompt budget for small max_prompt_size.
- Exempt insights jobs from branch-exclusion unless an explicit --branch
  filter was provided, since insights is read-only historical analysis.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: mariusvniekerk

cmd/roborev/insights.go

@@ -145,7 +145,7 @@ func runInsights(cmd *cobra.Command, opts insightsOptions) error {
 	})
 
 	ep := getDaemonEndpoint()
-	resp, err := ep.HTTPClient(30 * time.Second).Post(ep.BaseURL()+"/api/enqueue", "application/json", bytes.NewReader(reqBody))
+	resp, err := ep.HTTPClient(30*time.Second).Post(ep.BaseURL()+"/api/enqueue", "application/json", bytes.NewReader(reqBody))
 	if err != nil {
 		return fmt.Errorf("failed to connect to daemon: %w", err)
 	}

internal/daemon/server.go

@@ -710,13 +710,15 @@ func (s *Server) handleEnqueue(w http.ResponseWriter, r *http.Request) {
 
 	// Check if branch is excluded from reviews
 	currentBranch := git.GetCurrentBranch(gitCwd)
-	branchForJob := currentBranch
-	if req.Branch != "" {
-		branchForJob = req.Branch
-	}
 	branchToCheck := currentBranch
 	if req.JobType == storage.JobTypeInsights {
-		branchToCheck = branchForJob
+		// Insights is read-only historical analysis — only apply branch
+		// exclusion when an explicit branch filter was provided.
+		if req.Branch != "" {
+			branchToCheck = req.Branch
+		} else {
+			branchToCheck = ""
+		}
 	}
 	if branchToCheck != "" && config.IsBranchExcluded(repoRoot, branchToCheck) {
 		// Silently skip excluded branches - return 200 OK with skipped flag

internal/prompt/insights.go

@@ -95,7 +95,7 @@ func BuildInsightsPrompt(data InsightsData) string {
 	sb.WriteString("## Current Review Guidelines\n\n")
 	if data.Guidelines != "" {
 		guidelines := data.Guidelines
-		guidelineCap := max(promptBudget/10, 1024)
+		guidelineCap := min(promptBudget/10, 1024)
 		if len(guidelines) > guidelineCap {
 			guidelines = guidelines[:guidelineCap] + "\n... (guidelines truncated)"
 		}