feat(peek-cli): peek connect — supervised connector daemon (SP6b-2)

.changeset/peek-cli-connect-daemon.md

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+---
+"@peekdev/cli": minor
+---
+
+peek: `peek connect` — a supervised daemon for running connectors locally
+
+New `peek connect` command: register connectors (add/list/remove) in
+~/.peek/connect/connectors.json, and start/stop/status/logs a detached
+supervisor that spawns, monitors, and restarts-with-backoff each connector as a
+subprocess (single-instance lock, per-connector logs). Connectors are launched
+by a descriptor-default command (e.g. peek-connector-slack) or a per-entry
+override; peek-cli depends on no connector package. Autostart and a dashboard
+are future work.