diff --git a/.github/CODEOWNERS b/.github/CODEOWNERS
index 71f14c14a9..ae2c27bce7 100644
--- a/.github/CODEOWNERS
+++ b/.github/CODEOWNERS
@@ -1,11 +1,11 @@
 # Default reviewers
-* @lidge-jun @Ingwannu @Wibias
+* @lidge-jun @Ingwannu
 
 # High-impact runtime behavior
-/src/adapters/ @lidge-jun @Ingwannu @Wibias
-/src/providers/ @lidge-jun @Ingwannu @Wibias
-/src/codex/ @lidge-jun @Ingwannu @Wibias
-/src/server/ @lidge-jun @Ingwannu @Wibias
+/src/adapters/ @lidge-jun @Ingwannu
+/src/providers/ @lidge-jun @Ingwannu
+/src/codex/ @lidge-jun @Ingwannu
+/src/server/ @lidge-jun @Ingwannu
 
 # Repository automation and release security
 /.github/ @lidge-jun @Ingwannu
diff --git a/MAINTAINERS.md b/MAINTAINERS.md
index 3214adfdf1..43377c093d 100644
--- a/MAINTAINERS.md
+++ b/MAINTAINERS.md
@@ -9,7 +9,6 @@ review and merge policy.
 | --- | --- | --- |
 | [@lidge-jun](https://github.com/lidge-jun) | Project owner | Project direction, releases, repository administration, and final governance decisions |
 | [@Ingwannu](https://github.com/Ingwannu) | Maintainer | Issue and pull-request triage, `dev` integration, security review, and repository maintenance |
-| [@Wibias](https://github.com/Wibias) | Maintainer | Issue and pull-request triage, `dev` integration, and provider/CI maintenance |
 
 The table describes project responsibilities. Actual repository permissions remain controlled
 through GitHub repository settings.
@@ -17,6 +16,16 @@ through GitHub repository settings.
 `dev` is the only integration line. The former `dev2-go` carry duty is retired;
 see [The retired `dev2-go` line](#the-retired-dev2-go-line).
 
+## Former maintainers
+
+| GitHub account | Project role | Period |
+| --- | --- | --- |
+| [@Wibias](https://github.com/Wibias) | Maintainer | 2026-07-27 – 2026-08-19 |
+
+Former maintainers keep contributor standing and are welcome to open issues and pull requests like
+anyone else. Authorship credit in git history, release notes, and code comments is not rewritten
+when a maintainer steps down.
+
 ## Review and merge policy
 
 - Pull requests target `dev`. It is the only integration line, and promotion to
@@ -98,6 +107,24 @@ Adding or removing a maintainer requires:
 
 ### Change log
 
+- 2026-08-19 — [@Wibias](https://github.com/Wibias) stepped down as a maintainer
+  and is now a contributor. This follows his own decision to stop developing
+  opencodex; it is not a disciplinary action, and it was made with the owner's
+  agreement (requirement 1). Requirement 2 does not apply to a maintainer's own
+  resignation, which needs no second maintainer to ratify it. Requirement 3 is
+  met by this file and `.github/CODEOWNERS`, where the default-reviewer line
+  and the four runtime paths that listed him (`/src/adapters/`,
+  `/src/providers/`, `/src/codex/`, `/src/server/`) drop back to the two
+  remaining maintainers. Repository permission was reduced to read access at
+  the same time, so the roster and the GitHub settings agree again.
+
+  Nothing he authored is being unwound. His commits, the pull requests he
+  merged, the release-note attributions, and the code comments citing his
+  reviews stay exactly as they are, and the trust-lane gate derived from his
+  work in `.github/scripts/pr-sponsored-surface.cjs` keeps its attribution.
+  Returning to the maintainer table later would go through the same three
+  requirements that govern every addition.
+
 - 2026-07-27 — [@Wibias](https://github.com/Wibias) added as a maintainer.
   Requirement 1 (agreement from the project owner) is met: the owner requested
   the addition. **Requirement 2 (review by another current maintainer) was
@@ -105,10 +132,10 @@ Adding or removing a maintainer requires:
   carried the addition (`a2693c02`, `dc3a4ade`, `02bbd47a`) landed on `dev` as
   direct owner pushes with no associated pull request, so no second maintainer
   reviewed them. Requirement 3 is met by this file and `.github/CODEOWNERS`.
-  The addition is in effect regardless: @Wibias holds write access on the
-  repository and has been merging pull requests since 2026-07-26. This entry
-  records the gap rather than papering over it — a later maintainer change
-  should go through a reviewed pull request.
+  The addition took effect regardless: @Wibias held write access on the
+  repository and merged pull requests from 2026-07-26 until he stepped down on
+  2026-08-19. This entry records the gap rather than papering over it — a later
+  maintainer change should go through a reviewed pull request.
 
   Scope covers issue and pull-request triage, `dev` integration, and
   provider/CI maintenance. (This entry originally also described carrying
diff --git a/src/providers/antigravity-models.ts b/src/providers/antigravity-models.ts
index bf155b543c..1dc20d01f7 100644
--- a/src/providers/antigravity-models.ts
+++ b/src/providers/antigravity-models.ts
@@ -49,6 +49,15 @@ const RETIRED_FLASH_TIERS: Record<string, string> = {
   "gemini-3-flash-agent": "high",
 };
 
+// Some discovery responses still publish the current Flash thinking levels as
+// separate rows. These IDs are picker-visible when the response contains only a
+// partial tier set, but CCA accepts them only through the tiered wire ID.
+const CURRENT_FLASH_DISCOVERY_TIERS: Record<string, string> = {
+  "gemini-3.7-flash-low": "low",
+  "gemini-3.7-flash-medium": "medium",
+  "gemini-3.7-flash-high": "high",
+};
+
 const ANTIGRAVITY_WIRE_MODELS = [
   "gemini-3.7-flash-tiered",
   "gemini-3.1-pro-low",
@@ -511,17 +520,25 @@ export function retiredAntigravityFlashTier(modelId: string): string | undefined
  * Resolve a picker-visible base model + optional reasoning effort to the CCA wire model ID.
  *
  * Precedence (evaluated in order):
- * 1. Suffix wire ID or compat alias → resolve via `resolveAntigravityWireModelId`, no thinkingConfig.
- * 2. Mapped Gemini base with effort → return mapped wire ID + thinkingLevel.
- * 3. Mapped Gemini base without effort → return default-effort wire ID, no thinkingConfig.
- * 4. Claude Opus with effort → return identity + thinkingLevel (no suffix variants exist).
- * 5. All other IDs → return `resolveAntigravityWireModelId(modelId)`, no thinkingConfig.
+ * 1. Current Flash discovery tier → tiered wire ID + its thinkingLevel.
+ * 2. Suffix wire ID or compat alias → resolve via `resolveAntigravityWireModelId`, no thinkingConfig.
+ * 3. Mapped Gemini base with effort → return mapped wire ID + thinkingLevel.
+ * 4. Mapped Gemini base without effort → return default-effort wire ID, no thinkingConfig.
+ * 5. Claude Opus with effort → return identity + thinkingLevel (no suffix variants exist).
+ * 6. All other IDs → return `resolveAntigravityWireModelId(modelId)`, no thinkingConfig.
  */
 export function resolveAntigravityEffortWireModel(
   modelId: string,
   effort?: string,
   baseUrl?: string,
 ): { wireModelId: string; thinkingLevel?: string } {
+  const discoveryTier = Object.hasOwn(CURRENT_FLASH_DISCOVERY_TIERS, modelId)
+    ? CURRENT_FLASH_DISCOVERY_TIERS[modelId]
+    : undefined;
+  if (discoveryTier) {
+    return { wireModelId: GEMINI_FLASH_WIRE_ID, thinkingLevel: discoveryTier };
+  }
+
   // A collapsed picker row reports ONE representative wire id (whichever tier CCA
   // listed first), so live discovery cannot describe a ladder — it can only name a
   // single rung. Letting it answer for a base model we already have a ladder for
diff --git a/tests/google-antigravity-wire.test.ts b/tests/google-antigravity-wire.test.ts
index 986b3eef45..d613346e3c 100644
--- a/tests/google-antigravity-wire.test.ts
+++ b/tests/google-antigravity-wire.test.ts
@@ -288,6 +288,24 @@ describe("antigravity CCA envelope", () => {
     }
   });
 
+  test("routes partial Gemini 3.7 discovery tiers through thinkingLevel", async () => {
+    for (const [modelId, thinkingLevel] of [
+      ["gemini-3.7-flash-low", "low"],
+      ["gemini-3.7-flash-medium", "medium"],
+      ["gemini-3.7-flash-high", "high"],
+    ] as const) {
+      expect(resolveAntigravityEffortWireModel(modelId)).toEqual({
+        wireModelId: "gemini-3.7-flash-tiered",
+        thinkingLevel,
+      });
+
+      const req = await createGoogleAdapter(effortProvider).buildRequest(parsedWithEffort(modelId));
+      const env = JSON.parse(req.body);
+      expect(env.model).toBe("gemini-3.7-flash-tiered");
+      expect(env.request.generationConfig.thinkingConfig).toEqual({ thinkingLevel });
+    }
+  });
+
   test("ignores inherited CCA model and alias properties", () => {
     const inheritedModels = Object.create(null) as Record<string, unknown>;
     Object.defineProperty(inheritedModels, "__proto__", {