fix: keep slashes in model name for ai.run route

[gulybyte]

Bug

ai.run() percent-encodes the / in the model slug, e.g. @cf/meta/llama-3.3-70b-instruct-fp8-fast becomes @cf%2Fmeta%2Fllama-.... The Workers AI endpoint /accounts/{id}/ai/run/{model} requires the model name with literal / separators, so every request fails with:

400 {"success":false,"errors":[{"code":7000,"message":"No route for that URI"}]}

Root cause

The path template tag used to build the route percent-encodes every path parameter (including /). Verified against the live API: the same request succeeds via curl and via client.post() with a plain string.

Fix

Build the route with a plain string so the model name keeps its slashes. account_id is a hex slug and safe as-is.

this._client.post(`/accounts/${account_id}/ai/run/${modelName}`, { body, ...options })

Tests

Added run: keeps / in model name unencoded — mocks fetch, asserts the full request URL contains the literal / separators. Prettier/eslint/tsc clean.