020abccf57
Jackson was writing the computed \`hasPrivateKey\` into identity.json
and then refusing to read it back ("Unrecognized field hasPrivateKey")
on the next invocation. All amy commands that reload the data-dir
(\`marmot group create\`, \`marmot key-package publish\`, …) exited 1 at
the Context.open step. Pure boolean getter, no persistence needed.
https://claude.ai/code/session_01M6dCKAF5Y1VyHGZPjzwDXq