Add native celld configuration and KV store providers #437

Description

PR #422 adds native celld configuration snapshots and live ordinary KV through the embedded scoped API, on #414 native-provider infrastructure. It stays open for stack integration, service artifact availability and acceptance. This is celld store delivery, separate from the still-open runtime requirement #421 and its closed, unmerged previous PR #420.

Steps to reproduce

Select config and KV independently per logical ID on a generated native application. Test default-off refusal, mixed AWS/celld/local bindings, preparation budgets, redacted failures and startup ordering. Reproduce opt-in scoped-service acceptance against an identified reviewed artifact.

Expected behavior

Explicit default-off provider selection produces immutable config snapshots and live KV without changing portable traits or HTTP runtime ownership, with separate AWS/celld credentials and bounded work.

Impact

Local fixtures do not establish the availability/behavior of the companion service artifact or certify fleet forwarding, reload/failover, replication, production isolation or sustained stress.

Proposed fix

Review/integrate #422 after accepted prerequisites, retain per-ID bindings/feature isolation/generated consumers and document exact service/API dependency and acceptance limits. No celld Worker adapter, identity lifecycle Add/CAS, config hot reload or deployment/fleet certification is included.

Done when

• Review and merge Add native celld config and KV store providers #422 after integrating its prerequisite stack.
• Pass relevant provider, native startup, feature-isolation and generated-consumer checks against the revision being merged.
• Resolve or explicitly retain the documented dependency on the companion celld scoped API, with reproducible service acceptance and an available reviewed artifact.
• Preserve the PR's documented proof limits. Fleet forwarding, reload/failover, production isolation, replication/storage acceptance and sustained stress are not certified by local tests.

Detailed verification and remaining draft gates are recorded in #422. Related native-provider work is tracked in #410; portable store traits and HTTP runtime ownership remain unchanged.

Related

• Implementation PR Add native celld config and KV store providers #422; base Add native AWS configuration, secret, and ordinary KV store providers #410 / PR Add native AWS store providers #414, foundation Implement portable outbound HTTP and request lifecycle contracts #436 / PR feat: implement portable outbound HTTP and request lifecycle contracts #275.
• Add experimental local celld runtime adapter #421 is the separate HTTP runtime requirement; its previous PR feat(celld): add experimental local Worker runtime adapter #420 closed unmerged.
• Make the Axum adapter production-ready for self-hosted deployments #391 owns native HTTP production support.