refactor(security): migrate handleSecurity admin gate to shouldDenyAnonymous (#2567 follow-up)

[os-zhuang]

Final #2567 follow-up (Phases 1/2/docs merged as #2973 / #2987 / #2993). One-seam refactor — no behavior change beyond the 401 body adopting the shared shape.

Change

handleSecurity (/security/suggested-bindings, the ADR-0090 D5/D9 admin surface) was the last HTTP seam still hand-rolling the !userId && !isSystem → 401 check. It now delegates to the shared shouldDenyAnonymous decision like every other seam.

Semantics preserved deliberately: this gate is UNCONDITIONAL — requireAuth: true is hardcoded into the call, because an admin surface must deny anonymous callers even on a requireAuth: false demo deployment. The existing test pins this (dispatcher constructed with no options, where requireAuth defaults false, still expects 401); it now also asserts the shared body's code: 'unauthenticated'.

Triage — deliberately NOT migrated:handleNotification's !userId check. That is a "needs a user identity" predicate (the inbox is keyed by userId; a system context has no inbox), not an anonymous-posture decision — migrating it would let isSystem pass the gate and then query with an undefined userId.

Realtime "fourth door" investigation (no code — findings recorded here)

Also per the #2567 wrap-up, we audited whether a realtime/WebSocket/SSE surface constitutes an ungated fourth door. Verdict: no such door exists.

• service-realtime is an in-process pub/sub bus only (registerService('realtime') + the sys_presence object; the contract's optional handleUpgrade WebSocket hook is unimplemented). It registers zero HTTP routes.
• The dispatcher has no /realtime branch and no handleRealtime; neither the dispatcher-plugin nor the hono plugin mounts any realtime route — /api/v1/realtime falls through to the semantic 404.
• Producers publish after the engine's security middleware; consumers (webhooks auto-enqueuer, knowledge sync) are in-process. No inbound request path reaches the bus.
• AI SSE streaming enters exclusively through the gated handleAI path.
• The conformance ratchet correctly omits realtime — there is no entry point to enumerate.

One cosmetic defect found (tracked separately, not in this PR): discovery advertises realtime: ${prefix}/realtime even though the route 404s, and metadata-protocol references a nonexistent plugin-realtime provider.

Verification

• http-dispatcher + http-dispatcher.requireauth suites: 185/185 (401 case now also asserts the shared body code)
• Lint clean; check:single-authz-resolver intact; changeset added (@objectstack/runtime patch)

🤖 Generated with Claude Code

https://claude.ai/code/session_01ShknNUYoSTspJLBiqorD8V

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Project	Deployment	Actions	Updated (UTC)
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📓 Docs Drift Check

This PR changes 1 package(s): @objectstack/runtime.

16 hand-written doc(s) reference the affected code and may need an implementation-accuracy re-verification:

• content/docs/api/index.mdx(via @objectstack/runtime)
• content/docs/api/wire-format.mdx(via @objectstack/runtime)
• content/docs/automation/hook-bodies.mdx(via @objectstack/runtime)
• content/docs/concepts/north-star.mdx(via packages/runtime)
• content/docs/data-modeling/drivers.mdx(via @objectstack/runtime)
• content/docs/deployment/index.mdx(via @objectstack/runtime)
• content/docs/deployment/production-readiness.mdx(via @objectstack/runtime)
• content/docs/deployment/single-project-mode.mdx(via @objectstack/runtime)
• content/docs/deployment/vercel.mdx(via @objectstack/runtime)
• content/docs/getting-started/your-first-project.mdx(via @objectstack/runtime)
• content/docs/permissions/authentication.mdx(via @objectstack/runtime)
• content/docs/plugins/packages.mdx(via @objectstack/runtime)
• content/docs/protocol/kernel/http-protocol.mdx(via @objectstack/runtime)
• content/docs/protocol/kernel/index.mdx(via @objectstack/runtime)
• content/docs/protocol/kernel/lifecycle.mdx(via @objectstack/runtime)
• content/docs/releases/implementation-status.mdx(via @objectstack/runtime)

Advisory only. To re-verify, run the docs-accuracy-audit workflow scoped to these files:
node scripts/docs-audit/affected-docs.mjs origin/main → pass the list as args.docs.