docs: add maintenance console design + interactive prototypes

The design doc replaces the install-health framing in system-monitor-design-ideas.org with a maintenance console: dense metric subpanels behind a persistent selector, a doctor that streams into a results wall, determinate remedies only (guard-armed updates, curation lifecycles for noise, listeners, containers, and orphans), rotary band selectors on the tall subpanels, and a CLI-first build with a four-layer test strategy. Every decision is dated in the doc.

Prototypes A-E5 keep the exploration path: five divergent layouts converging into E5, a fully interactive simulation whose GOOD/BAD snapshots become the build's test fixtures.

todo.org gains the spec-create task, the panel keybinding-family task, and scope notes on the net/bt doctor retrofit.

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