docs(connectors): design diff from the page to the Signal artboard (02 · Connectors)

[lilyshen0722]

The design diff lily-shen asked for (pod 63356) before Kai brings V2ConnectorsPage to the Coverage artboard 02 · Connectors under TASK-007, after #1537 and #1538 land.

docs/plans/connectors-page-signal-diff.md:

• §1 what changes (frame, rows, dots, one action per row, add flow, aside) and what moves (relay/mode, code step, Slack confirm → the aside for the selected row)
• §2 the state table — the same TASK-005/006 states with the artboard's marks; no state added or removed
• §3 the aside as the selected channel: the step it needs, the conversation panel, What the channel sees
• §4 every place the artboard shows something the kernel does not count: ADR-029 D6 ledger (conversation + counts), connectedAt, Cancel on transients, the capability catalog, leadAgentUsername
• §5 the layout-invariant pins that replace the connectors block (re-pin, never delete)
• §6 390 · §7 gate (1440 + 390 screenshots beside the artboard, computed colours, scrollWidth)

Docs only.

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