Backend fabric extension

examples/backends/context-package-backend.yaml

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+id: local-context-packages
+kind: context-backend
+name: Local Context Package Registry
+version: "1"
+capabilities:
+  - context_packages
+  - policy
+  - provenance
+  - source_maps
+storage:
+  engine: filesystem
+  path: .markitect/context
+policy:
+  mode: labels
+description: Local manifest for agent-ready context packages.

examples/backends/local-sqlite-backend.md

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+# Local SQLite Backend
+
+```yaml markitect-backend
+id: local-sqlite-cache
+kind: cache-backend
+name: Local SQLite Cache
+version: "1"
+capabilities:
+  - snapshots
+  - json
+  - jsonpath
+  - fts
+  - sql
+  - provenance
+  - reference_graph
+  - processor_results
+storage:
+  engine: sqlite
+  path: .markitect/cache/index.sqlite
+policy:
+  mode: labels
+description: Local backend manifest for future snapshot and index work.
+```