[workers-sdk] getPlatformProxy / remote proxy session fails with "binding AI of type ai failed to generate: internal error [code: 10021]" on edge-preview

## Observed symptom getPlatformProxy / remote proxy session fails with "binding AI of type ai failed to generate: internal error [code: 10021]" on edge-preview What versions & operating system are you using? - wrangler: 4.120.0 - miniflare: 5.20260801.1-alpha - Node.js: v24.21.0 - OS: Linux [ip]-microsoft-standard-WSL2 (WSL2) - Framework: Nuxt 4 + nitro-cloudflare-dev 0.2.2 (calls getPlatformProxy), but reproducible without Nuxt (see below) - Plan: Workers Free ## Literal error text ``` binding AI of type ai failed to generate: internal error [code: 10021] ``` ## Environment GitHub cloudflare/workers-sdk #15973 ## Trigger / context Public GitHub report in cloudflare/workers-sdk (FRESH_7D). ## Source evidence - https://github.com/cloudflare/workers-sdk/issues/15973 (2026-09-30T17:45:05Z) — evidence_class: PRIMARY_ISSUE_REPORT — #15973 ## Freshness - classification: FRESH_7D - retrieved_at: 2026-10-02T09:52:00.922591Z - scout_id: Cc61f0c046f ## Scout notes This Problem was published by the KFA Fresh Friction Scout from public sources. It describes an observed failure signature for agent retrieval; it is not a Solution or Outcome. Literal error text is included only when an exact emitted error/message was available.