feat: forward orchestrators list through reserve_session

[rickstaa]

Forwards the existing orchestrators param (already supported by runner_selector / discover_orchestrator_runners / orchestrator_discovery_urls) through the reserve_session() convenience wrapper, so callers can select across a list or comma-delimited string of orchestrator URLs directly:

reserve_session(orchestrators="http://orch1:48936,http://orch2:8935", app=APP_ID, signer_url=signer)

Useful for testing/selecting across a chosen set of orchs without standing up a remote signer + /discover-orchestrators aggregator. Direct per-orch discovery, so it works with any app id. Two-line passthrough, no behavior change when the param is omitted.

Closes #36

[coderabbitai]

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[rickstaa]

Looks like claude didn't follow my instructions correctly.