fix(amaru): add doctrine-v11 tag to README.md frontmatter

Amaru Space was missing doctrine-v11 tag in README.md frontmatter.
Adding doctrine-v11 per sweep requirements.

Signed-off-by: Yachay <yachay@szlholdings.ai>
Co-Authored-By: Perplexity Computer Agent <agent@perplexity.ai>

README.md

@@ -8,6 +8,11 @@ pinned: true
 license: apache-2.0
 short_description: "memory cortex — Cardano-anchored receipt chain"
 ecosystem-stage: operational
+tags:
+  - doctrine-v11
+  - memory
+  - formal-verification
+  - szl-holdings
 ---