fix: centralize verbose overrides and tool stream gating

src/sessions/level-overrides.ts

@@ -0,0 +1,34 @@
+import {
+  normalizeVerboseLevel,
+  type VerboseLevel,
+} from "../auto-reply/thinking.js";
+import type { SessionEntry } from "../config/sessions.js";
+
+export function parseVerboseOverride(
+  raw: unknown,
+):
+  | { ok: true; value: VerboseLevel | null | undefined }
+  | { ok: false; error: string } {
+  if (raw === null) return { ok: true, value: null };
+  if (raw === undefined) return { ok: true, value: undefined };
+  if (typeof raw !== "string") {
+    return { ok: false, error: 'invalid verboseLevel (use "on"|"off")' };
+  }
+  const normalized = normalizeVerboseLevel(raw);
+  if (!normalized) {
+    return { ok: false, error: 'invalid verboseLevel (use "on"|"off")' };
+  }
+  return { ok: true, value: normalized };
+}
+
+export function applyVerboseOverride(
+  entry: SessionEntry,
+  level: VerboseLevel | null | undefined,
+) {
+  if (level === undefined) return;
+  if (level === null) {
+    delete entry.verboseLevel;
+    return;
+  }
+  entry.verboseLevel = level;
+}