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The "HTTP handler for POST /activity glue" bullet (6e) pre-dates the Step 8 dispatch refactor that landed the same functionality with broader test coverage. `http_server:route/2` already wires POST `/activity` to `nx_kernel:publish/1` when the kernel process is registered (success → 200 with `cid: <Cid>` body via `cid_response/1`; sig/replay failure → 422 via `validation_failed_response/0`), and falls back to the stub `post_activity_response/0` when the kernel isn't running. Per-format response variants (json / sx / cbor / activity+json) followed in 8d-dispatch-post via `cid_response_for/2` + `post_activity_response_for/1`. Verified by the standing suites: `next/tests/http_publish.sh` 10/10 and `next/tests/http_post_format.sh` 13/13. Plan-only commit — no source changes, no test changes. Routes the next iteration past 6e onto the next genuinely unticked sub-deliverable. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>