add env param to command type

[jackcbrown89]

Note

Medium Risk
Introduces environment-variable injection into both command execution and agent invocation, which can change runtime behavior and has potential security/secret-handling implications if misused. Scope spans both the TypeScript runtime protocol/types and the Python client serialization/tests.

Overview
Adds environment variable plumbing end-to-end: InvocationMessage now carries agent_env (forwarded to AgentInvocation.env), and Command/CommandInterface now support per-command env.

Updates the TypeScript runtime to merge command env on top of process.env when spawning commands and to pass invocation agent_env into the Claude handler’s SDK options; adds/updates unit tests accordingly. Updates the Python client/types/docs/tests to serialize these new fields and demonstrate usage in query() and execute_commands().

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[jackcbrown89]

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