Standardize documentation with headers and archive old files

Applied a unified header format to all documentation files for better status identification, referencing, and ownership tracking. Archived outdated roadmaps, reports, and journal entries. Updated playbooks with new responsibilities, lifecycle rules, and consistent handover formats to align with the new archiving strategy.
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+---
+type: Session Log
+date: 2026-01-15
+participants:
+  - Senior Backend Developer
+  - User
+topic: Backend Infrastructure Analysis & Ping Service Hardening
+status: BLOCKED
+---
+
+# Session Log: Backend Infrastructure Analysis
+
+## 1. Context
+The goal was to start "Phase 1: Backend Hardening" for the `ping-service` as defined in the Master Roadmap. The Senior Backend Developer began analyzing the existing infrastructure to ensure a solid foundation before implementing security and resilience features.
+
+## 2. Key Findings & Analysis
+A deep dive into `backend/infrastructure` revealed significant inconsistencies:
+
+*   **Persistence Conflict (Blocker):**
+    *   `ping-service` is configured for **JPA/Hibernate** (`spring-boot-starter-data-jpa`).
+    *   The shared library `backend/infrastructure/persistence` (specifically `DatabaseUtils.kt`) is built exclusively for **Exposed** (Kotlin SQL Framework).
+    *   This creates a "split-brain" situation regarding ORM strategy.
+
+*   **Missing Security Infrastructure:**
+    *   No shared security module exists (`backend/infrastructure/security`).
+    *   Implementing OAuth2/RBAC directly in `ping-service` would violate DRY principles.
+
+*   **Messaging Overhead:**
+    *   `backend/infrastructure/messaging` includes heavy Kafka dependencies.
+    *   It is unclear if the "Tracer Bullet" (Ping Service) requires Kafka or if a simple REST-based Delta-Sync is sufficient.
+
+## 3. Actions Taken
+*   Analyzed `build.gradle.kts` of `ping-service` and infrastructure modules.
+*   Identified the blocking architectural questions.
+*   **Created Pending ADR:** `docs/01_Architecture/adr/000-PENDING-backend-infrastructure-decisions.md` containing a catalog of questions for the Lead Architect.
+
+## 4. Next Steps
+*   **WAITING FOR:** Lead Architect to resolve the JPA vs. Exposed decision.
+*   **WAITING FOR:** Decision on extracting a shared security module.
+*   Once decisions are made, the Backend Developer will proceed with:
+    1.  Refactoring persistence (either removing JPA or rewriting infrastructure).
+    2.  Implementing the Security Hardening.
+
+## 5. Artifacts Created
+*   `docs/01_Architecture/adr/000-PENDING-backend-infrastructure-decisions.md`
+
+---
+*Logged by: Documentation & Knowledge Curator (Proxy)*