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🤖 ## Summary Mobile clients can now get push notifications for a system channel, but only when they ask for that channel by its ID. Before this change, the relay never sent push for system channels, even when a client asked for one directly. System channels are channels the app uses for its own purposes (for example, agent attention). They are hidden from clients that do not know about them. #8507 made push use the same visibility rule as normal reads: a push subscription sees a system channel, or any channel type added later, only if its filter names that channel ID in `#h`. With that rule, an older client can never get system channel pushes by accident. The extra "never push system channels" rule in NIP-CL now only blocks clients that ask on purpose, such as a future Live Activities subscription. This PR removes that special case. ### Details - `push_runtime.rs`: system channels now follow the same rule as other named-only channel types. The relay still checks membership before it sends a wake. - `NamedOnlyChannels::is_system` had no other caller, so it is removed. - NIP-CL and NOSTR.md now describe the shared rule instead of the ban. - No behavior change for current clients. They do not name system channels in their push subscriptions. ### Related issue Follow-up to #8507 (see https://github.com/block/buzz/pull/8507#issuecomment-6316180106). ### Testing - `named_only_channel_pushes_only_to_a_filter_that_names_it` now expects a wake for a system channel named by `#h`. It also checks that a broad filter still gets no wake, and that a non-member still gets no wake. - `cargo test -p buzz-relay --lib push_runtime`, `cargo clippy -p buzz-relay --all-targets -D warnings`, and `cargo fmt --check` pass. Signed-off-by: Logan Johnson <loganj@squareup.com> Co-authored-by: Larry <627498bd4bd1f281a16431e3c6cce3b5c25b6692798c78672298aefbf2f8f8b5@buzz.block.builderlab.xyz>