Update ConfigKit and prepare Narratio v2.1.2

docs/releases/v2.1.2.md

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+# Narratio v2.1.2
+
+This release allows secrets directories to contain hidden metadata without
+preventing credential loading.
+
+## Summary
+
+ConfigKit v0.3.1 ignores dot-prefixed entries such as `.git`, `.gitignore`, and
+`.DS_Store` during secrets bootstrap. These entries no longer block otherwise
+valid credentials from loading and are omitted from bootstrap reports.
+
+## Compatibility
+
+This is a backward-compatible dependency bug fix. Configuration schemas,
+existing-environment precedence, and validation of non-hidden entries are
+unchanged. Hidden entries still count toward the directory entry limit.
+
+## Upgrade
+
+No special upgrade action or configuration migration is required. See the
+[credential configuration reference](../config.md) for secrets-directory usage.
+
+## Changes
+
+- Updated ConfigKit from v0.3.0 to v0.3.1.
+- Clarified hidden-entry handling in the secrets-directory documentation.