embedctl 0.2.1

Scope notes

• Future 0.2.x releases should be cut as narrow patch releases instead of bundling unrelated readiness improvements into one broad release.

Prototype hardening

• Added safe workflow record --live prototype output: it writes a replayable profile-declared snapshot flow without payload values when allowed, or returns typed unavailable JSON without attempting live bridge execution.
• Expanded logs --follow JSON with bounded collection, source classification, command privacy, and stream/artifact contract fields.
• Expanded profiling JSON with launch/steady/frame evidence fields plus target-side source/status/confidence/unknowns/next_actions.
• Expanded provider list/doctor output with read-only prototype adapter records for labgrid, Jumpstarter, tbot, LAVA export, and power/measurement/OTA hook contracts.