Probe tagged-union ListTags shape + surface raw bodies on miss

read/ListTags with an empty body was returning something we couldn't
parse, so every tag lookup silently missed and the CreateTag duplicate
fallback dead-ended with no diagnostic.

Now the tag lookup tries two request styles in order — the per-endpoint
`read/ListTags {}` used by the rest of this file, then the tagged-union
`read {type: "ListTags", params: {}}` used by mbecker20/komodo's
canonical API. If both fail to yield a match, both raw response bodies
get logged so the actual Komodo shape is diagnosable on the next run
without another commit-and-deploy cycle.

src/lib/server/integrations/komodo.ts

@@ -548,27 +548,55 @@ function unwrapTagList(body: unknown): unknown[] {
     return [];
 }
 
+/**
+ * Fetch the tag list from Komodo. Two request styles are attempted in order:
+ *
+ *   1. `POST /read/ListTags` with an empty body — the per-endpoint style
+ *      already used by the rest of this file (see execute/RestartDeployment).
+ *   2. `POST /read` with `{type: "ListTags", params: {}}` — the tagged-union
+ *      style used by mbecker20/komodo's canonical API. If your Komodo build
+ *      wires up only the tagged-union path, style #1 returns something we
+ *      can't parse (empty array or non-tag payload) and we fall through.
+ *
+ * The winning parsed list is returned. The raw response bodies get logged
+ * only when both attempts fail to yield a match, so a fresh Komodo API shape
+ * is diagnosable without spamming stderr on the happy path.
+ */
+async function fetchTagsWithFallback(): Promise<{ tags: unknown[]; rawBodies: string[] }> {
+    const attempts: Array<{ path: string; body: unknown }> = [
+        { path: 'read/ListTags', body: {} },
+        { path: 'read', body: { type: 'ListTags', params: {} } }
+    ];
+    const rawBodies: string[] = [];
+    for (const attempt of attempts) {
+        let res: Response;
+        try {
+            res = await komodoCall(attempt.path, attempt.body);
+        } catch (err) {
+            rawBodies.push(`${attempt.path}: network error — ${(err as Error).message}`);
+            continue;
+        }
+        if (!res.ok) {
+            const snippet = await res.text().catch(() => '');
+            rawBodies.push(`${attempt.path}: HTTP ${res.status}${snippet ? ` — ${truncate(snippet)}` : ''}`);
+            continue;
+        }
+        const raw = await res.text().catch(() => '');
+        rawBodies.push(`${attempt.path}: ${truncate(raw)}`);
+        let parsed: unknown;
+        try {
+            parsed = JSON.parse(raw);
+        } catch {
+            continue;
+        }
+        const tags = unwrapTagList(parsed);
+        if (tags.length > 0) return { tags, rawBodies };
+    }
+    return { tags: [], rawBodies };
+}
+
 async function findTagByName(name: string): Promise<KomodoTagResult | null> {
-    let listRes: Response;
+    const { tags, rawBodies } = await fetchTagsWithFallback();
-    try {
-        listRes = await komodoCall('read/ListTags', {});
-    } catch (err) {
-        console.warn(`[komodoEnsureTag] ListTags network failure for "${name}":`, (err as Error).message);
-        return null;
-    }
-    if (!listRes.ok) {
-        const snippet = await listRes.text().catch(() => '');
-        console.warn(`[komodoEnsureTag] ListTags HTTP ${listRes.status} for "${name}"${snippet ? `: ${truncate(snippet)}` : ''}`);
-        return null;
-    }
-    let body: unknown;
-    try {
-        body = await listRes.json();
-    } catch (err) {
-        console.warn(`[komodoEnsureTag] ListTags non-JSON body for "${name}":`, (err as Error).message);
-        return null;
-    }
-    const tags = unwrapTagList(body);
     for (const t of tags) {
         if (!t || typeof t !== 'object') continue;
         const tagName = (t as { name?: unknown }).name;
@@ -576,6 +604,11 @@ async function findTagByName(name: string): Promise<KomodoTagResult | null> {
         const id = extractTagId(t);
         if (id) return { ok: true, id };
     }
+    // Miss — dump the raw bodies so the next iteration knows the real shape.
+    console.warn(
+        `[komodoEnsureTag] no matchable tag "${name}" in any ListTags variant. Bodies:\n  ` +
+        rawBodies.join('\n  ')
+    );
     return null;
 }