feat(operations): rebuild liveness and readiness probes on current main

[seonghobae]

Objective

Reconstruct the buyer-visible availability contract directly on current protected main, without importing stale ancestry.

Exact current-main reconstruction

• protected base: eb0a32e87e7470469c8fa0f8c67d9583654bef57;
• exact current head: 559346b9e5ac8d249a8ac52c47771be0dfaddad4;
• branch is exactly one commit ahead and zero behind protected main;
• changed paths are exactly the probe controller, focused regression, and operator guide;
• both modified protected-main input blobs were byte-identical to predecessor feat(operations): separate liveness and readiness on current main #446's construction inputs;
• all three output blobs are byte-identical to the reviewed feat(operations): separate liveness and readiness on current main #446 result.

Availability contract

GET /healthz maps Spring Boot liveness to controlled 200 {"status":"ok"} or 503 {"status":"broken"}. GET /readyz maps traffic readiness to controlled 200 {"status":"ready"} or 503 {"status":"not_ready"}. Both endpoints are unauthenticated and non-cacheable and disclose no tenant, credential, dependency, queue, topology, or exception detail. Missing ApplicationAvailability fails construction rather than inventing health.

Scope boundary

Instance probe semantics and operator guidance only. This does not add dependency readiness contributors, startup-recovery gates, capacity/backpressure wiring, persistence, or deployment publication.

Merge gate

Keep Draft until exact-head CI, Security Scan, SAST Semgrep, fuzz, zero valid unresolved findings, and qualifying independent non-author approval are present. Predecessor checks and approvals do not transfer.

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