WorkstationBridge takes environment_variables for its shell

[abonneth]

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Note

Low Risk
Optional constructor parameter with defaults; critical sandbox env vars are still applied after the user map, so behavior for existing callers is unchanged.

Overview
WorkstationBridge now accepts an optional environment_variables mapping that is merged into the LocalCodeSandbox shell environment when the driver is created.

Callers can inject extra vars (e.g. RUN_CONFIG) for commands run in ~/hai/<session_id>. Built-in workstation settings still win where they are set after the merge—CUA_SESSION stays the bridge session id, PATH still includes the desk CLI, and COORDINATE_SYSTEM / CUA_CURSOR behave as before.

The workstation shell integration test was extended to assert a custom variable is visible in execute while session and PATH behavior remain correct.

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