[TaylorMutch]

Summary

Persist validated, expiring evidence of application routes installed by supervisors. Integrate the shared-supervisor ownership authority merged in #4864 so dedicated and shared installations can be advertised safely.

Based on main at d7b616895. Stacked on feat/4666-supervisor-app-endpoints/TaylorMutch.

Related Issue

Closes #4939. Part of RFC 0017.

Changes

• Resolve trusted application endpoints through the optional ComputeDriverAppEndpoints.ResolveSupervisorAppEndpoint extension RPC, independently of GetSandbox. The baseline ComputeDriver service and existing factories remain compatible. In-process factories register the optional resolver during build; unsupported drivers withhold publication; resolution failures cannot fail ordinary sandbox observations.
• Fence installation reports and discovery eligibility by runtime, configuration, session, credential epoch, current acknowledged pool owner, and process/member readiness.
• Resolve shared application endpoints from trusted Kubernetes membership and Pod state, independently of runtime control addresses.
• Revalidate durable authority before each serving lease; enforce absolute lease expiry and a shared listener serving-authority bound of at most 15 seconds, closing stale streams.
• Preserve workload identity across owner changes; keep gateway-session identity independent of supervisor takeover identity.

Release Notes

Testing

• 40 focused combined-stack Rust regression tests cover listener routing, route-limit concurrency, shutdown fencing, advertisements, discovery, and proxy behavior.
• Local k3d validated the Service removal with dedicated push/poll, abrupt shared-owner takeover, HTTP/WebSockets, network-policy denial, freshness/withdrawal, outage recovery, and disabled-listener gateway access. Workload identity and memory survived owner changes.
• Real Go SDK snapshots/watches and workspace-restricted discovery credentials drove two proxy replicas; both followed Pod-IP endpoints, graceful owner handover, and route withdrawal without per-sandbox app Services.
• Helm lint/unit/parser/coherence/scaling checks, Python lint/format/type checks, and topology assertions passed.

Live Kubernetes validation preceded integration of the latest listener hardening;
focused Rust regressions validate that final integration. New-head CI is pending.

Qualification limits

Live HA validation exercised supervisor process/Pod loss on a local k3d cluster. Whole-node failure, real network partitions, metric-driven HPA, sustained production load, and published release artifacts remain unqualified. Grant-file projection contributes to revocation propagation time. Main now includes #4842 for gateway-mediated hashed hostnames. Direct application-listener/discovery hostnames remain readable; extending hashed naming to that path and installation-status presentation (#4670) remain separate work.

The example Kubernetes HTTPRoute controller is a deferred compatibility POC outside this stack.

Checklist

• Follows Conventional Commits
• Commits are signed off (DCO)
• Relevant implementation, configuration, and API documentation updated

PR dependency order: #4936 → #4940 → #4941 → #4956 → #4963 → #4964 → #4957 → #4958.

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