Add twenty cases around real ctx state, channels and Trio scopes,
with inert actor resources.
Cover independent status initialization and diagnostics, falsey
results, repeated waits and transport-vs-self-cancel detection.
Check first-fault delivery and shallow-frozen identity metadata.
Exercise self-cancel ack policy, existing and ancestor reasons,
and local validation provenance at the message-raising boundary.
Use `.wait_for_result()` so these tests also cover the subsequent
deprecated-wrapper removal. Test provenance is already recorded
with the preceding status implementation.
Prompt-IO: ai/prompt-io/opencode/20260919_context_fault_status.md
(this patch was generated in some part by `opencode`
using `gpt-6-astra` (`openai`))
Gud Boi