An audit found e2ee.rs, ai.rs, and plugin.rs implemented no real
functionality: signature verification did no cryptography, the AI
engine returned canned strings with no model call, and the plugin
runtime executed no code. These modules were pub-exported but wired
nowhere in the workspace, and their tests asserted on the fabricated
output rather than real behavior. E2EE, local AI, and plugins are
deferred features; deferred features must be absent, not fake-present.
A workspace-wide grep confirmed no code outside these three files and
their lib.rs declarations referenced any of their exported symbols.
Refs #244#79#80#81