Add registry inventory and drift views

workplans/RAIL-FAB-WP-0004-registry-inventory-and-drift.md

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+---
+id: RAIL-FAB-WP-0004
+type: workplan
+title: "Registry Inventory And Drift Views"
+domain: railiance
+repo: railiance-fabric
+status: completed
+owner: codex
+topic_slug: railiance
+planning_priority: high
+planning_order: 4
+created: "2026-05-17"
+updated: "2026-05-17"
+---
+
+# RAIL-FAB-WP-0004 - Registry Inventory And Drift Views
+
+## Goal
+
+Make the registry useful as an inspection surface, not only an ingestion
+surface.
+
+Agents and humans should be able to ask what a registered repo currently
+contains, search across graph/library/artifact data, and compare graph snapshots
+to see what changed.
+
+## Tasks
+
+### T01 - Repository Inventory View
+
+```task
+id: RAIL-FAB-WP-0004-T01
+status: done
+priority: high
+```
+
+Add a repo inventory view that returns repository metadata, latest snapshot
+summary, graph nodes/edges from that snapshot, artifacts, libraries, and counts.
+
+### T02 - Snapshot Listing And Drift
+
+```task
+id: RAIL-FAB-WP-0004-T02
+status: done
+priority: high
+```
+
+Expose snapshot listing and graph drift between two snapshots. By default, drift
+compares the latest snapshot with the previous snapshot for the same repo.
+
+### T03 - Registry Search
+
+```task
+id: RAIL-FAB-WP-0004-T03
+status: done
+priority: medium
+```
+
+Add a simple search endpoint across repositories, graph nodes, artifacts, and
+libraries.