docs(requirements): add rings to check rows

Add explicit northstar ring fields to check requirements without changing behavior.

req: check/001

req: check/002

req: check/003

req: check/004

AGENTS.md

@@ -63,7 +63,7 @@ Keep it stable. Prefer pointers to canonical sources over copied structure, file
 - Use `cargo run -p hemx-xtask -- app new PATH` for the generic page/form/keyed-row/notice starter, and `cargo run -p hemx-xtask -- app new --mobile PATH` for the phone-first starter with host capabilities, recovery truth, and release-kit commands; do not treat it as a mobile framework or store-submission bot. req: ceremony/005 req: ceremony/006 req: ceremony/007
 - The public component-reuse explanation lives in `docs/recipes/reusable-partials.md`; do not grow a client component framework to explain partial composition.
 - The stable public `.heml` authoring surface lives in `docs/hemplate-syntax.md`; Hemlate examples must use that real hemplate syntax, not Vue/Handlebars sketches. hemx-build consumes hemplate Surface facts and must not grow an independent `.heml` parser or CSS-path identity model. Generated resources, form/handle metadata, atoms, and event constants come from hemx-build facts, not hand-written app plumbing. Forms remain HTML-shaped, checked against user-authored Rust domain types, parsed through `FormValue`, and manipulated through generated form/control ids rather than selectors. req: surface/001 req: surface/002 req: surface/003 req: surface/004 req: surface/005 req: surface/006 req: surface/007 req: surface/008 req: surface/009 req: surface/010 req: codegen/001 req: codegen/003 req: codegen/004 req: codegen/005 req: codegen/006 req: form/001 req: form/004 req: form/007 req: form/008 req: form_effects/001 req: form_effects/002 req: form_effects/003
-- Optional `.heml` editor overlays must share authority with `hemx-build` diagnostics and `docs/hemplate-syntax.md`; `hemx-lsp` owns editor protocol glue for diagnostics/completion/hover and derive-known template facts, while VS Code/Cursor/Neovim keep normal HTML/tree-sitter tooling. Do not create a second template language, selector model, formatter, Rust type system, or custom editor framework. req: diagnostics/004 req: diagnostics/005 req: diagnostics/006 req: diagnostics/007 req: diagnostics/008
+- Optional `.heml` editor overlays must share authority with `hemx-build` diagnostics and `docs/hemplate-syntax.md`; `hemx-lsp` owns editor protocol glue for diagnostics/completion/hover and derive-known template facts, while VS Code/Cursor/Neovim keep normal HTML/tree-sitter tooling. Do not create a second template language, selector model, formatter, Rust type system, or custom editor framework. Cross-file template/handler references visible to build validation must fail at `cargo check` with useful spans. req: diagnostics/004 req: diagnostics/005 req: diagnostics/006 req: diagnostics/007 req: diagnostics/008 req: check/001 req: check/003
 - JS runtime changes must preserve root-scoped lookup, delegated listeners, postcard EffectBatch application, fail-closed request handling, transactional/recoverable failure behavior, root-scoped error outlets, and tiny pending/failure/trigger-timing conventions without selectors, VDOM, expressions, or per-node listeners. req: runtime/001 req: runtime/002 req: runtime/003 req: runtime/005 req: runtime/006 req: failure/001 req: failure/002 req: failure/003 req: failure/004 req: failure/005 req: failure/006 req: convention/001 req: convention/003 req: convention/005 req: convention/007
 - Opaque island JavaScript is a leaf adapter for high-frequency local behavior only; use native events/generated helpers at the boundary and do not introduce a component runtime, client state graph, VDOM, selector interop, or second UI model. req: canonical_authoring/017 req: interop/001 req: interop/002 req: interop/003 req: interop/006 req: interop/007 req: interop/008 req: interop/009 req: interop/010 req: interop/011 req: interop/012
 - Host capability adapters must stay at the `hemx-host` boundary: typed capabilities use fire/request/stream/schedule shapes; adapters may call host APIs and return host events, but they must not mutate DOM or own app/domain state. req: host/001 req: host/002

REQUIREMENTS.md

@@ -858,16 +858,16 @@ what a valid business email is. [north_star]
 ## check
 
 ### req: check/001
-001	All symbolic cross-file references visible to build/proc-macro validation are verified at `cargo check`. Unknown handle → hard error. Unknown slot → hard error. Type mismatch between slot and atom → hard error.
+0	001	All symbolic cross-file references visible to build/proc-macro validation are verified at `cargo check`. Unknown handle → hard error. Unknown slot → hard error. Type mismatch between slot and atom → hard error.
 
 ### req: check/002
-002	Dead/missing handle diagnostics are best-effort by default. With `#[hemx::component]`, dead/missing handlers inside the component are checked at `cargo check`. Without it, missing implementations are caught at app mount or in generated registry tests.
+0	002	Dead/missing handle diagnostics are best-effort by default. With `#[hemx::component]`, dead/missing handlers inside the component are checked at `cargo check`. Without it, missing implementations are caught at app mount or in generated registry tests.
 
 ### req: check/003
-003	Renaming a slot or handle breaks `cargo check` immediately with a span pointing to the Rust handler or template source.
+0	003	Renaming a slot or handle breaks `cargo check` immediately with a span pointing to the Rust handler or template source.
 
 ### req: check/004
-004	Root-scoped slot lookup: JS runtime resolves `data-sid` only within the nearest/current `data-hemx-root`.
+0	004	Root-scoped slot lookup: JS runtime resolves `data-sid` only within the nearest/current `data-hemx-root`.
 
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