[RefImpl] Wire subagentStop in the Claude Code and Cursor adapters #131

Target runtime or language

The Claude Code and Cursor adapters in adapters/, from #22

What this proves

That a framework with no session chain can report subagent completion honestly. Both adapters leave subagentStop unmapped because hooks/subagent-stop.json required final_chain_hash, and neither framework can know that value. #21 made the field optional and added the rule in §8.6 for how a Guardian treats its absence, so the event can now be emitted without a fabricated hash.

Done means Claude Code's SubagentStop and Cursor's subagentStop emit steps/subagentStop without final_chain_hash, the emission suites validate those payloads against the schema, and the KNOWN_UNMAPPED entries and mapping docs are updated.

Do you intend to implement this yourself

No, I am proposing it for someone else

Current Priority Scope

Feeds conformance evidence