hardbyte / netchecks / 25720152968

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feat(cli): --source-ip option for tcp, http, and dns probes

Closes #70.

All three probe types now accept a local source IP to bind the
outgoing socket to. Surfaced as a top-level CLI option and as a
`source-ip` field in the run config:

  netcheck tcp  --host github.com --port 443 --source-ip 192.168.1.10
  netcheck http --url https://example.com --source-ip 192.168.1.10
  netcheck dns  --host example.com           --source-ip 192.168.1.10

Implementation notes:
- TCP uses socket.create_connection(source_address=(ip, 0)).
- HTTP uses a small urllib3 SourceAddressAdapter mounted on a
  per-call requests.Session.
- DNS uses dnspython's Resolver.resolve(source=ip), which already
  exposes the source address parameter.

The source-ip echoes back in the probe spec so it shows up in
PolicyReport evidence.

36 of 36 new or added lines in 4 files covered. (100.0%)

392 of 418 relevant lines covered (93.78%)

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