spec: add envVars to ConnectSandbox request model

Extends POST /sandboxes/{sandboxID}/connect to accept optional
environment variables. Field is optional, wire name envVars matches
create-time sandbox env convention.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: FisherXZ

.changeset/connect-envs-on-reconnect.md

@@ -0,0 +1,6 @@
+---
+'e2b': minor
+'@e2b/python-sdk': minor
+---
+
+Add support for passing environment variables when reconnecting to a sandbox via `Sandbox.connect()`.

packages/js-sdk/src/api/schema.gen.ts

@@ -660,6 +660,9 @@ components:
           type: integer
           format: int32
           minimum: 0
+        envVars:
+          $ref: '#/components/schemas/EnvVars'
+          description: Environment variables to set in the sandbox on reconnect. Merged into the sandbox environment and applied to processes started after resume.
 
     TeamMetric:
       description: Team metric with timestamp