fix(server): inject HostProcessPlatform into the Grok plan extractor

The plan.md path check read process.platform and process.env directly; thread
the host platform reference and the adapter's provider environment through
GrokAdapterV2Options instead.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
4b04bdd85dJulius Marminge committed on 9/5/2026, 4:54:27 AMparent999dd54
2 files changedLine totals unavailable