Advisory issues read as advice rather than failure

`ADVISORY_ISSUES` moves next to `ValidationIssue` in pipeline.py, and the
model derives an `advisory` flag from its own code, so the distinction the
engine already made ships to the client instead of being re-guessed there.

The dock keeps its summary in `--destructive` only when a real fault is
among the issues and paints an advisory row `--muted-foreground`; the
canvas leaves advisories off a node's dot and border entirely, since node
status has three colours and no warning tier.

biome checks the generated `openapi.json`, which nothing formats since the
SDK script dropped its format pass — ignore it like the other generated
files.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_013Gf7WaExcJ9bs3kfJXB3nK

frontend/src/client/schemas.gen.ts

@@ -3185,12 +3185,18 @@ export const ValidationIssueSchema = {
                 }
             ],
             title: 'Message Name'
+        },
+        advisory: {
+            type: 'boolean',
+            title: 'Advisory',
+            description: 'Worth saying, but not a fault — the UI says so in a softer tone.',
+            readOnly: true
         }
     },
     type: 'object',
-    required: ['code', 'message'],
+    required: ['code', 'message', 'advisory'],
     title: 'ValidationIssue',
-    description: 'A problem that keeps a flow from running correctly.'
+    description: 'Something wrong with a flow — a fault, or merely advisory.'
 } as const;
 
 export const ValidationResultSchema = {

frontend/src/client/types.gen.ts

@@ -1057,7 +1057,7 @@ export type ValidationError = {
 };
 
 /**
- * A problem that keeps a flow from running correctly.
+ * Something wrong with a flow — a fault, or merely advisory.
  */
 export type ValidationIssue = {
     code: 'cycle' | 'unconnected_input' | 'missing_initial_value' | 'node_error' | 'unauthenticated_hook' | 'self_loop_needs_initial';
@@ -1067,6 +1067,10 @@ export type ValidationIssue = {
     node?: (string | null);
     port?: (string | null);
     message_name?: (string | null);
+    /**
+     * Worth saying, but not a fault — the UI says so in a softer tone.
+     */
+    readonly advisory: boolean;
 };
 
 export type code = 'cycle' | 'unconnected_input' | 'missing_initial_value' | 'node_error' | 'unauthenticated_hook' | 'self_loop_needs_initial';