docs(requirements): add rings to host rows

Add explicit northstar ring fields to host capability requirements without changing behavior.

req: host/001

req: host/002

req: host/003

req: host/004

req: host/005

AGENTS.md

@@ -66,6 +66,6 @@ Keep it stable. Prefer pointers to canonical sources over copied structure, file
 - 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
 - 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; it must not introduce a component runtime, client state graph, VDOM, or second UI model. req: canonical_authoring/017
-- Host capability adapters must stay at the `hemx-host` boundary: they may call host APIs and return host events, but they must not mutate DOM or own app/domain state. req: host/002
+- 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
 - Local/offline app behavior should be commands/events/projections; do not add `hemx-local`, stored DOM patches, stored `EffectBatch` truth, or a core client state graph without a proven reusable contract. req: canonical_authoring/018 req: canonical_authoring/019 req: local/001 req: local/002
 - Axum apps should serve and load the shared runtime through hemx-axum helpers such as `runtime_js_path()` and `runtime_js()`, not hard-coded `/hemx.js` URLs or app-owned cache-busting strings; keep hemx-axum as route/runtime/handler adapter around generated partial swaps, not a routing owner. req: axum_integration/001 req: axum_integration/002 req: axum_integration/003 req: axum_integration/005 req: axum_integration/006

REQUIREMENTS.md

@@ -592,19 +592,19 @@ what a valid business email is. [north_star]
 ## host
 
 ### req: host/001
-001	Host capabilities are declared as typed capability uses with one of four shapes: fire, request, stream, or schedule. This contract covers browser, PWA, WebView, and native-shell hosts without adding a second UI runtime.
+0	001	Host capabilities are declared as typed capability uses with one of four shapes: fire, request, stream, or schedule. This contract covers browser, PWA, WebView, and native-shell hosts without adding a second UI runtime.
 
 ### req: host/002
-002	Host adapters may produce host events or perform explicit host side effects, but they must not mutate DOM, own application/domain state, append domain events, bypass generated hemx effects, or introduce a client app-state framework.
+0	002	Host adapters may produce host events or perform explicit host side effects, but they must not mutate DOM, own application/domain state, append domain events, bypass generated hemx effects, or introduce a client app-state framework.
 
 ### req: host/003
-003	Permission-sensitive host capabilities require an explicit user-facing reason in the app-owned manifest before standard host checks may pass.
+0	003	Permission-sensitive host capabilities require an explicit user-facing reason in the app-owned manifest before standard host checks may pass.
 
 ### req: host/004
-004	Host checks report concrete failures for undeclared capability use, unsupported host capability shape, and missing permission reasons before a host adapter executes the capability call.
+0	004	Host checks report concrete failures for undeclared capability use, unsupported host capability shape, and missing permission reasons before a host adapter executes the capability call.
 
 ### req: host/005
-005	Host results return to app code as facts. App/domain code decides whether they become commands, events, persistence, or UI effects; hemx UI updates still happen through normal EffectBatch output.
+0	005	Host results return to app code as facts. App/domain code decides whether they become commands, events, persistence, or UI effects; hemx UI updates still happen through normal EffectBatch output.
 
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