Reach a pod by name: --connection benchpod-a1b2c3 / a1b2c3

[wardviaene]

benchpod setup --connection a1c5c7 failed with "no BenchPod answers at a1c5c7:8080": a bare pod name was dialed as a hostname, and the CLI's resolver does not resolve .local either (benchpod-a1c5c7.local fails with an i/o timeout).

What changes

• parseTarget takes a value shaped like a pod name (benchpod-a1b2c3, a1b2c3, optional .local; regex ^(benchpod-)?[0-9a-f]{6}(\.local)?$) and looks it up with the CLI's own mDNS browse (the one discover uses). The browse ends as soon as the pod answers. Every other hostname goes to the system resolver as before.
• A pod not heard on the LAN falls back to usb:<name>, with a one-line note on stderr.
• The lookup runs at most once per name per run, because a command parses its connection several times.
• Two browses (1.2 s + 1.8 s) instead of one 3 s browse: the pod's lwIP responder does not repeat a multicast answer within 1 s, and zeroconf only queries again after 4 s. Without the second browse, back-to-back commands missed the pod every other run.
• set-connection <name> saves the resolved LAN address (like discover --save), or usb:benchpod-<id> when the pod was only heard on USB or its USB link, so later commands skip the lookup.
• README (Connection table, new "Pod names" paragraph, set-connection reference, examples) and the --connection / set-connection help are updated.

Tests

• Unit tests cover the name pattern (including hostnames that must not match), resolution on the LAN, the USB fallback, the once-per-run cache, mDNS entry matching, address choice, and set-connection in three cases.
• TestIdentityWipeOnlyOverUSB now stubs the lookup, so benchpod-a1b2c3.local still resolves to a LAN address there.
• Read-only check on the bench (benchpod-a1c5c7, lock free, ping/status only): --connection a1c5c7, benchpod-a1c5c7 and benchpod-a1c5c7.local reach the pod in 0.1 to 1.3 s across 8 back-to-back runs. benchpod-baea06 (unplugged from the LAN) falls back to USB.

Notes

• The embeddedci.com CLI docs snapshot (embeddedci-server webapp/src/docs/coverage/cli.json) needs a refresh for the new help text.
• internal/fwrefusals fails locally against the sibling firmware checkout. That is unrelated to this change.

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