Add enterprise docs structure and include pending core maintenance updates.

docs/adr/0001-storage-engine-and-source-generation.md

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+# 0001 Storage Engine And Source Generation
+
+## Status
+
+Accepted
+
+## Context
+
+CBDD targets embedded workloads where predictable latency and low operational overhead are priorities. Runtime reflection and remote database dependencies increase startup and runtime variance for this workload profile.
+
+## Decision
+
+1. Use an embedded storage engine with page-based persistence and WAL-backed transactions.
+2. Use compile-time source generation for mapping instead of runtime reflection.
+3. Keep query and indexing execution in-process for deterministic behavior.
+
+## Consequences
+
+Positive:
+- Lower runtime allocation and startup overhead.
+- Strong control over transaction and recovery behavior.
+- Predictable deployment for local/offline workloads.
+
+Trade-offs:
+- Greater maintenance burden for custom storage/query engine internals.
+- Source generator complexity requires dedicated regression coverage.
+
+## Related Documents
+
+- [`../architecture.md`](../architecture.md)
+- [`../runbook.md`](../runbook.md)
+- [`../../RFC.md`](../../RFC.md)