- internal/agent: outbound WSS to core with SPKI pin checked inside the TLS
handshake, Ed25519 challenge-response, one-shot join secret (dropped from
memory and cli.env after the first ready), forwarding of core requests to the
local awg-ctrl with an internal token, dead-connection timer on pings,
backoff up to a minute (a minute after 4003)
- path filter is stricter than the Node one where it relied on WHATWG URL
normalisation: backslashes, a leading "//" and %2e dot segments are rejected
- tests: end-to-end against a fake TLS core and a fake awg-ctrl; also checked
by hand against the real awg-ui/nodes.ts hub
- CI: Go build, vet and race tests on GitHub and Gitea
