fix(tests): stabilize graph path snapshots and skip LLM preflight for non-LLM graphs

- Update 5 more dry_run_examples snapshots to use [GRAPH_PATH] filter
- Skip LLM preflight check when graph has no LLM nodes (fixes
  preflight_allows_pull_request_enabled_without_github_credentials)

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

lib/crates/fabro-cli/tests/it/workflow/dry_run_examples.rs

@@ -15,7 +15,7 @@ fn dry_run_branching() {
     ----- stdout -----
     ----- stderr -----
     Workflow: Branch (6 nodes, 6 edges)
-    Graph: [TEMP_DIR]/branching.fabro
+    Graph: [GRAPH_PATH]
     Goal: Implement and validate a feature
 
     warning [node: implement]: Node 'implement' has goal_gate=true but no retry_target or fallback_retry_target (goal_gate_has_retry)
@@ -52,7 +52,7 @@ fn dry_run_conditions() {
     ----- stdout -----
     ----- stderr -----
     Workflow: Conditions (5 nodes, 5 edges)
-    Graph: [TEMP_DIR]/conditions.fabro
+    Graph: [GRAPH_PATH]
     Goal: Test condition evaluation with OR and parentheses
 
         Run: [ULID]
@@ -86,7 +86,7 @@ fn dry_run_parallel() {
     ----- stdout -----
     ----- stderr -----
     Workflow: Parallel (7 nodes, 7 edges)
-    Graph: [TEMP_DIR]/parallel.fabro
+    Graph: [GRAPH_PATH]
     Goal: Test parallel and fan-in execution
 
         Run: [ULID]
@@ -121,7 +121,7 @@ fn dry_run_styled() {
     ----- stdout -----
     ----- stderr -----
     Workflow: Styled (5 nodes, 4 edges)
-    Graph: [TEMP_DIR]/styled.fabro
+    Graph: [GRAPH_PATH]
     Goal: Build a styled pipeline
 
         Run: [ULID]
@@ -156,7 +156,7 @@ fn dry_run_legacy_tool() {
     ----- stdout -----
     ----- stderr -----
     Workflow: LegacyTool (3 nodes, 2 edges)
-    Graph: [TEMP_DIR]/legacy_tool.fabro
+    Graph: [GRAPH_PATH]
     Goal: Verify backwards compatibility with old tool naming
 
         Run: [ULID]

lib/crates/fabro-server/src/run_manifest.rs

@@ -580,11 +580,13 @@ async fn run_llm_check(
                 .collect::<Vec<_>>();
             let auth_issues = result.auth_issues;
             let mut model_providers = std::collections::BTreeSet::new();
+            let mut has_llm_nodes = false;
 
             for node in graph.nodes.values() {
                 if !is_llm_handler_type(node.handler_type()) {
                     continue;
                 }
+                has_llm_nodes = true;
                 let node_model = node.model().unwrap_or(&model);
                 let node_provider = node.provider().unwrap_or(default_provider);
                 let (resolved_model, resolved_provider) =
@@ -601,6 +603,10 @@ async fn run_llm_check(
                 model_providers.insert((resolved_model, final_provider));
             }
 
+            if !has_llm_nodes {
+                return true;
+            }
+
             if model_providers.is_empty() {
                 let (resolved_model, resolved_provider) =
                     if let Some(info) = Catalog::builtin().get(&model) {