Add next-level architecture skeleton

[RicheyWorks]

Overall Classification: WARN
Campaign: Next-Level Architecture Skeleton Campaign
Slot: ARCH-G01
Scope: docs/test-only architecture control-plane import

Summary:

• Adds the uploaded next-level architecture skeleton under docs/architecture/.
• Adds a read-only documentation guard for WARN boundaries, 500-slot/50-campaign structure, source-card and ADR templates, planning-only wording, and forbidden overclaim phrases.
• Does not update README.md or docs/REVIEWER_TRUST_MAP.md in this PR to avoid overlapping reviewer-index churn with the separate open Core-LB-G01 PR Core-LB-G01: Add load balancer feature contract #333.

Verification:

• mvn test "-Dtest=NextLevelArchitectureSkeletonDocumentationTest" passed: 7 tests, 0 failures, 0 errors, 0 skipped.
• mvn test "-Dtest=NextLevelArchitectureSkeletonDocumentationTest,AgentCampaignSystemArchitectureDocumentationTest,AdvancedReadmeAgentContractDocumentationTest" passed: 17 tests, 0 failures, 0 errors, 0 skipped.
• mvn -q test passed.
• mvn -q "-DskipTests" package passed.
• mvn -B package passed: 2,488 tests, 0 failures, 0 errors, 0 skipped.
• git diff --check passed.
• git diff --check origin/main...HEAD passed.
• git diff --cached --check passed.
• .\scripts\smoke\enterprise-lab-workflow.ps1 -Package passed.

Safety:

• No production code changed.
• No Maven config changed.
• No CI/workflow changed.
• No Dockerfile/Compose changes.
• No scripts, secrets, deployment files, runtime resources, endpoints, external targets, or automation changed.
• No merge performed.

Not-proven boundaries:

• No production readiness/certification.
• No live-cloud or real-tenant validation.
• No runtime enforcement claim.
• No load/stress/benchmarking evidence.
• No throughput/p95/p99 production evidence.
• No replay/evidence/report/storage/export proof.
• No broader automation.