docs(cef): ctx.memory — the shared memory bank surface

[spoluyan]

What

Documents ctx.memory for agent authors in the cef:develop skill, alongside the rule that keeps the two stores distinct, and bumps the plugin to 0.2.0.

• The developer rule, stated once: who reads this later, and does each row need its own visibility? — work happens in ctx.cubby, durable conclusions go to ctx.memory.
• Write semantics: privacy is required on every write, one of public|internal|private|restricted, never defaulted; neighbours rows are typed ({id, type, title, scope, privacy, edgeType}).
• The reserved alias: a cubby named memory now gets a cef build warning (agent-sdk/cli release carrying it).

Sequencing

Merge after the @cef-ai/agent-sdk 4.1.0 and @cef-ai/cli releases are on npm — this documents shipped behavior (CEF-AI/sdk#193).

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