The id-keyed persistent write-stdin / close-stdin landed implemented in #867 but were never test-locked, and the canonical WIT still tags them (NOT YET IMPLEMENTED) along with two stale PERSISTENT TIER banners claiming the whole tier is stubbed until the registry lands. Add a registry acceptance test (deliver bytes; a by-id re-write standing in for a post-reset instance; close-stdin EOF; cap / ownership / closed edges) and drop the stale tags so the contract matches reality. The ProcessHandle (ephemeral) stdin form, attach, and watch/unwatch remain genuinely deferred.
The id-keyed persistent write-stdin / close-stdin landed implemented in #867 but were never test-locked, and the canonical WIT still tags them (NOT YET IMPLEMENTED) along with two stale PERSISTENT TIER banners claiming the whole tier is stubbed until the registry lands. Add a registry acceptance test (deliver bytes; a by-id re-write standing in for a post-reset instance; close-stdin EOF; cap / ownership / closed edges) and drop the stale tags so the contract matches reality. The ProcessHandle (ephemeral) stdin form, attach, and watch/unwatch remain genuinely deferred.