feat: collect accountability root evidence

workplans/RAIL-FAB-WP-0018-accountability-root-discovery-update-loop.md

@@ -86,7 +86,7 @@ Result:
 
 ```task
 id: RAIL-FAB-WP-0018-T02
-status: todo
+status: done
 priority: high
 state_hub_task_id: "09246f06-10db-4c6c-9cb3-f2808fdbaa38"
 ```
@@ -110,6 +110,27 @@ Done when:
   state;
 - adapters can run against the current local Railiance workspace.
 
+Result:
+
+- Added `railiance_fabric/accountability_roots.py` to load and validate the
+  accountability root manifest and collect raw evidence from registered roots.
+- Added `schemas/accountability-root-evidence.schema.yaml` for
+  `AccountabilityRootEvidenceRun` payloads.
+- Added `railiance-fabric discover-roots` with `--manifest`,
+  `--max-items-per-root`, and opt-in `--include-remote`.
+- Implemented initial adapters for registry manifests, repository checkouts,
+  host paths, deployment/infrastructure/service/endpoint file roots, State Hub
+  metadata roots, Gitea metadata roots, and metadata-only backup/secret roots.
+- Raw evidence carries source, provenance, fingerprints, durable evidence
+  state, and `live_telemetry: false` without promoting candidates into accepted
+  graph state.
+- Added adapter coverage in `tests/test_accountability_root_adapters.py` and
+  documented the evidence command in the manifest/operator docs.
+- Verified with
+  `python3 -m pytest tests/test_accountability_roots.py tests/test_accountability_root_adapters.py -q`,
+  `python3 -m railiance_fabric.cli discover-roots --max-items-per-root 5`,
+  and full `python3 -m pytest`.
+
 ## T03 - Build Evidence Store And Identity Normalization
 
 ```task