Advance permission-slip to security key support

With sshauth speaking the sk- algorithms, a hardware key in the
agent now serves the whole flow.

Co-Authored-By: Claude Mythos 5 <noreply@anthropic.com>

Author: plotnick

Cargo.lock

@@ -38,8 +38,8 @@ memmap2 = "0.9"
 p256 = { version = "0.13", features = ["ecdsa", "pkcs8"] }
 pem-rfc7468 = { version = "0.7", features = ["std"] }
 percent-encoding = "2"
-permission-slip-client = { git = "https://github.com/oxidecomputer/permission-slip", rev = "07b5953145cd55bcf14b2461c40639eaced3bd77" }
-permission-slip-common = { git = "https://github.com/oxidecomputer/permission-slip", rev = "07b5953145cd55bcf14b2461c40639eaced3bd77" }
+permission-slip-client = { git = "https://github.com/oxidecomputer/permission-slip", rev = "c9d302ef44576e075e35f4f28f8e7ac8345bcd4b" }
+permission-slip-common = { git = "https://github.com/oxidecomputer/permission-slip", rev = "c9d302ef44576e075e35f4f28f8e7ac8345bcd4b" }
 progenitor = "0.14"
 progenitor-client = "0.14"
 pwd = "1"