audit work

src/__Libraries/StellaOps.Cryptography.Plugin.BouncyCastle/AGENTS.md

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+# BouncyCastle Crypto Plugin Charter
+
+## Mission
+Provide BouncyCastle-backed Ed25519 signing for StellaOps cryptography.
+
+## Responsibilities
+- Keep provider behavior deterministic and thread-safe.
+- Avoid leaking private key material from descriptors.
+- Track task status in `TASKS.md`.
+
+## Required Reading
+- `docs/modules/platform/architecture-overview.md`
+
+## Working Agreement
+- 1. Update task status in the sprint file and local `TASKS.md`.
+- 2. Keep key normalization and signature formats stable.
+- 3. Add tests for edge cases and key normalization rules.