Replace Air's kill-and-rerun loop in the debug image with the pilot
persistent-delve supervisor: src/dev/dlv-watch.sh owns one headless
`dlv exec --multiclient --continue` server, rebuilds ./tmp/main on save and
restarts only the debug target through the tiny rpc2 client in
src/dev/dlv-restart. An attached VS Code session (and its breakpoints) now
survives saves instead of reconnecting after every reload.
The debug compose builds locally with `pull_policy: build` and without
`build.network: host`: compose cannot grant the network.host entitlement, so
a cold `up` previously failed with "additional privileges requested"; the
default bridge reaches the dev Gitea for module resolution.
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