feat(server): ACP sessionUpdate parity for Grok clients - #5422

💭 I'm checking the modified files to see if they violate Effect service conventions, looking at the imports they're using to understand the pattern. Now I'm checking the changes in AcpSessionRuntime.ts and CursorAdapter to see what's been modified in those areas. Let me check the CursorAdapter change region around lines 840-910 to see if there's anything unusual, like a new case being added to a switch statement for handling parsed events. I'm checking for service convention violations and test imports—everything looks fine. The ProviderDriverKind.make("cursor") call is valid too. But there's a tension here: the instruction wants the response to be exactly "All clear" on one line, yet the system requires JSON schema compliance. I need to respect the schema while keeping the output clean, though the default behavior is to fail this check. Since there are no findings, I should mark this as a success and put "All clear" in the title or summary field of the JSON response.