feat(monitor): add reward-hacking measurement schemas

CHANGELOG.md

@@ -33,6 +33,7 @@
 - Viewer: log listing responses include the log dir's canonical URI (`log_dir_uri`) so the viewer can reliably scope its local cache to the directory.
 - Inspect View: Reuse one warm async S3 client and connection pool across requests — for both log reads and directory listings — instead of creating one per operation, eliminating the per-request credential/connection cold-start (e.g. `/log-headers` ~3s -> ~0.3s, `/logs` ~1.5s -> ~0.06s).
 - Model Roles: `resolve_model_roles` now copies a `Model` passed by object (e.g. via `eval(model_roles=...)`) before stamping its role, so roles supplied through the Python API — not just `--model-role` — get a distinct instance and are not misattributed. (#4464)
+- Monitoring: New public schema types represent oracle-isolated monitor context, signal derivation and availability, and append-only attempt/sample records.
 
 ## 0.3.247 (16 July 2026)
 

src/inspect_ai/monitor/__init__.py

@@ -0,0 +1,17 @@
+from ._types import (
+    ComponentRef,
+    MonitorContext,
+    MonitorRecord,
+    ProducerRef,
+    SignalDerivation,
+    SignalValue,
+)
+
+__all__ = [
+    "ComponentRef",
+    "MonitorContext",
+    "MonitorRecord",
+    "ProducerRef",
+    "SignalDerivation",
+    "SignalValue",
+]