chore(release): finalize v3.8.11 changelog + repair release-gate test drift

Finalize the 3.8.11 cycle CHANGELOG and clear the failures the full test:unit
gate surfaced (release-branch drift — PR merges bypassed pre-push):

- CHANGELOG: date the [3.8.11] section (2026-06-05) + repo-housekeeping roll-up
- docs(env): document THEOLDLLM_NAV_TIMEOUT_MS in .env.example + ENVIRONMENT.md
  (env-doc-sync gate; #3217 added the var without docs)
- test(nvidia): exercise the #3226 bypass-fetch path via a local HTTP server and
  hoist the validator import (patching globalThis.fetch no longer intercepts the
  un-patched native fetch captured by proxyFetch)
- test(i18n): import the shipped normalizeComplianceEventTypes helper (#3185)
- test(model-caps): save synced metadata under the canonical gemini-3.1-pro key
  now that #3229 aliases gemini-3.1-pro-high/-low to it
- test(web-session): expect the grok-web "sso + sso-rw" credential hint (#3180)
- test(synced-models): isolate DATA_DIR so the #3199 hidden-override stops
  bleeding into the shared DB and breaking the re-run precondition

.env.example

@@ -585,6 +585,11 @@ CODEX_OAUTH_CLIENT_ID=app_EMoamEEZ73f0CkXaXp7hrann
 # Trae OAuth token override. Used by: open-sse/executors/trae.ts.
 # TRAE_TOKEN=
 
+# ── The Old LLM (theoldllm) ──
+# Playwright navigation timeout (ms) for the browser-backed token capture.
+# Used by: open-sse/executors/theoldllm.ts. Default: 30000 (30s).
+# THEOLDLLM_NAV_TIMEOUT_MS=30000
+
 # ── Gemini / Gemini CLI / Antigravity / Windsurf (all Google-based) ──
 # These providers ship public OAuth client_id/secret values (or Firebase Web
 # keys) embedded in their public CLIs/binaries. Defaults are baked into the