Add the sush proxy to the switch zone - #11253
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This continues the integration of the [Support Shell](https://github.com/oxidecomputer/sush) ([RFD 620](https://rfd.shared.oxide.computer/rfd/0620)), building on the sled-agent embedding: a new switch zone service, `sush-proxy`, terminates technician-port connections and routes each request to a sled's sush server. The proxy finds sush servers by probing the bootstrap and underlay prefixes given by DDM, and polls MGS for the cubby map so a request may name its target sled by cubby. **For security review:** On real hardware the proxy serves TLS backed by the sled's platform identity. At zone startup, sled-agent generates an ephemeral key and has the RoT sign its certificate with the TQ key (Ed25519 over the SHA3-256 digest of the TBS certificate), and the sush client verifies that the chain ends at a platform identity root. Simulated and emulated environments have no RoT, so their proxies serve plaintext. Co-Authored-By: Claude Mythos 5 <noreply@anthropic.com>
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Continues the integration of the Support Shell (RFD 620), building on the sled-agent embedding: a new switch zone service,
sush-proxy, terminates technician-port connections and routes each request to a sled's sush server. The proxy finds sush servers by probing the bootstrap and underlay prefixes given by DDM, and polls MGS for the cubby map so a request may name its target sled by cubby.For security review:
On real hardware the proxy serves TLS backed by the sled's platform identity. At zone startup, sled-agent generates an ephemeral key and has the RoT sign its certificate with the TQ key (Ed25519 over the SHA3-256 digest of the TBS certificate), and the sush client verifies that the chain ends at a platform identity root. Simulated and emulated environments have no RoT, so their proxies serve plaintext.