more audit work

src/__Libraries/StellaOps.Provcache.Valkey/AGENTS.md

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+# Provcache Valkey Library Charter
+
+## Mission
+- Provide Valkey/Redis-backed caching for Provcache with deterministic keying and TTL behavior.
+
+## Responsibilities
+- Keep key prefixing and invalidation deterministic and bounded.
+- Propagate cancellation where supported by the client library.
+- Avoid full keyspace scans in production paths.
+
+## Required Reading
+- docs/modules/prov-cache/architecture.md
+- docs/modules/platform/architecture-overview.md
+
+## Working Directory & Scope
+- Primary: src/__Libraries/StellaOps.Provcache.Valkey
+
+## Testing Expectations
+- Add unit tests for cache hit/miss, TTL handling, and invalidation flows.
+- Validate batch operations and pattern invalidation safeguards.
+
+## Working Agreement
+- Update sprint status in docs/implplan/SPRINT_*.md and local TASKS.md.
+- Keep outputs deterministic and ASCII-only in comments/logs.