feat(sse): restore GPT-6 Astra effort aliases and Codex 0.153.4 pin (#13026)

Three related things that genuinely belong together: the registry and suffix splitter not knowing Astra while the live catalog serves it, the Codex client pin Astra requires, and dropping `next/font/google` so a production image build does not reach fonts.googleapis.com.

---

Validated in one consolidated worktree cut from `release/v3.8.51`, boarded with the other 19 PRs of this batch. Two in-batch conflicts, both additive and resolved by keeping each side: the `ENVIRONMENT.md` table (#13035 + #13011) and the `chatHelpers.ts` import block (#12975 on the tip + #13017).

- `typecheck:core` clean; `check:dashboard-typecheck` OK (206 pre-existing, within baseline); `check:changelog-integrity` OK; `check:docs-counts` migrations ✓
- complexity 2816 / baseline 3218 and cognitive-complexity 1271 / baseline 1437 — both under baseline
- 531 of 532 focused assertions green across the batch's 46 test files
- `check-file-size` rebaselined for the batch's real growth (annotation `_rebaseline_2026_09_11_mergebatch_v3851_houminxi`, landed on #13038), attributed per PR

The single red is **not this batch**: `tests/unit/combo/quota-weighted-strategy.test.ts` → "A/B isolation: 7 hard-empty + 2 at 0.5% + 1 at 40%, floor=1" asserts an order between two connections of identical weight and flakes on the pure tip too — 2 failures in 4 runs at `origin/release/v3.8.51` with nothing from this batch applied.

⚠️ base-red inherited: #12732 — `Docs Gates`, `Merge integrity`, `No new ESLint warnings`, `Unit Tests fast-path` and `Fast Quality Gates` reproduce on the pure tip (provider count 356 vs the 358 the modules define, SKILL.md drift, and `open-sse/utils/stream.ts` at 3115 > frozen 3098, untouched here).

Thanks @HouMinXi — the live evidence on these (X500 logs, `storage.sqlite` state, real `/v1/models` probes, the 36-minute outage write-up) is what let a 20-PR batch be reviewed as a unit.

src/shared/constants/codexClient.ts

@@ -3,7 +3,7 @@
 // refresh this so the fingerprint OpenAI sees from the OAuth/Responses face
 // matches the real client version. Overridable per-deployment via
 // CODEX_CLIENT_VERSION.
-export const DEFAULT_CODEX_CLIENT_VERSION = "0.153.2";
+export const DEFAULT_CODEX_CLIENT_VERSION = "0.153.4";
 export const CODEX_CLI_RS_ORIGINATOR = "codex_cli_rs";
 
 export function getCodexCliRsHeaders(

src/shared/constants/modelSpecs.ts

@@ -118,6 +118,12 @@ const GEMINI_36_FLASH_MODEL_SPEC = {
 } satisfies ModelSpec;
 
 export const MODEL_SPECS: Record<string, ModelSpec> = {
+  // Public model limits; the Codex registry supplies its smaller OAuth window.
+  // https://developers.openai.com/api/docs/models/gpt-6-astra
+  "gpt-6-astra": {
+    ...GPT_5_6_MODEL_SPEC,
+    aliases: ["openai/gpt-6-astra"],
+  },
   "gpt-5.6": {
     ...GPT_5_6_MODEL_SPEC,
     aliases: ["openai/gpt-5.6"],

src/shared/constants/pricing/frontier-labs.ts

@@ -3,6 +3,7 @@
  * Pure data; merged by default-pricing.ts via spread (god-file decomposition; semantic split).
  */
 import {
+  GPT_6_ASTRA_PRICING,
   GEMINI_3_7_FLASH_PROMO_PRICING,
   GPT_5_5_PRICING,
   GPT_5_6_LUNA_PRICING,
@@ -20,6 +21,7 @@ import {
 
 export const DEFAULT_PRICING_FRONTIER = {
   openai: {
+    "gpt-6-astra": GPT_6_ASTRA_PRICING,
     "gpt-5.6": GPT_5_6_SOL_PRICING,
     "gpt-5.6-sol": GPT_5_6_SOL_PRICING,
     "gpt-5.6-terra": GPT_5_6_TERRA_PRICING,

src/shared/constants/pricing/oauth-subscriptions.ts

@@ -3,6 +3,7 @@
  * Pure data; merged by default-pricing.ts via spread (god-file decomposition; semantic split).
  */
 import {
+  GPT_6_ASTRA_PRICING,
   CLAUDE_FABLE_5_1_PRICING,
   CLAUDE_OPUS_5_PRICING,
   GEMINI_3_7_FLASH_PROMO_PRICING,
@@ -19,6 +20,10 @@ const ANTIGRAVITY_GEMINI_3_7_PRICING = {
   "gemini-3.7-flash-high": GEMINI_3_7_FLASH_PROMO_PRICING,
 };
 
+// Codex Standard: 250 / 25 / 1250 credits per MTok, at 25 credits per USD.
+// https://developers.openai.com/codex/pricing
+const GPT_6_ASTRA_CODEX_PRICING = GPT_6_ASTRA_PRICING;
+
 export const DEFAULT_PRICING_OAUTH = {
   cc: {
     "claude-fable-5-1": CLAUDE_FABLE_5_1_PRICING,
@@ -88,6 +93,13 @@ export const DEFAULT_PRICING_OAUTH = {
     },
   },
   cx: {
+    "gpt-6-astra": GPT_6_ASTRA_CODEX_PRICING,
+    "gpt-6-astra-ultra": GPT_6_ASTRA_CODEX_PRICING,
+    "gpt-6-astra-max": GPT_6_ASTRA_CODEX_PRICING,
+    "gpt-6-astra-xhigh": GPT_6_ASTRA_CODEX_PRICING,
+    "gpt-6-astra-high": GPT_6_ASTRA_CODEX_PRICING,
+    "gpt-6-astra-medium": GPT_6_ASTRA_CODEX_PRICING,
+    "gpt-6-astra-low": GPT_6_ASTRA_CODEX_PRICING,
     "codex-auto-review": GPT_5_5_PRICING,
     // Codex uses credits per 1M tokens. OmniRoute stores the dollar-equivalent
     // values below at the documented conversion of 25 credits per USD.

src/shared/constants/pricing/shared-tiers.ts

@@ -1,6 +1,16 @@
 /**
  * Pricing data — shared per-MTok tier constants (god-file decomposition). Pure data; merged by the barrel.
  */
+// OpenAI API Standard; Codex Standard has the same dollar-equivalent rates.
+// https://openai.com/index/gpt-6-astra/
+export const GPT_6_ASTRA_PRICING = {
+  input: 10.0,
+  output: 50.0,
+  cached: 1.0,
+  reasoning: 50.0,
+  cache_creation: 12.5,
+};
+
 export const GPT_5_3_CODEX_PRICING = {
   input: 5.0,
   output: 20.0,