feat(clan): re-enable dm-pull-deploy via forked clan-community 🌊

Stage 4e, take 2. Point the clan-community input at our fork's branch
that sanitizes machine.name for data-mesher's file-name validator
(upstream PR: clan/clan-community#25). Revisit this pin once merged.

- flake.nix: clan-community.url → fork + fix branch
- flake-modules/clan.nix: re-adds meta.domain = "clan",
  inventory.instances.data-mesher (sunken-ship bootstrap, both default),
  inventory.instances.dm-pull-deploy (sunken-ship push, both default
  action="switch"), and clanHostsModule that puts /etc/hosts entries
  for <host>.clan → each machine's ZT IPv6 so libp2p multiaddr
  resolution works without a clan-domain DNS server.
- Generator vars for data-mesher + dm-pull-deploy signing keys were
  regenerated on sunken-ship (data-mesher isn't packaged for
  aarch64-darwin, so clan vars generate runs on Linux).

vars/per-machine/sunken-ship/data-mesher-node-identity/identity.cert/secret

@@ -0,0 +1,18 @@
+{
+	"data": "ENC[AES256_GCM,data:OmnzynETGrQK8os5sSZ2Uo6+Ssurkt8wqnJU3f5pNDNBwBPLlcYfDzslkHu4eDGLpiJnVwyFJPdzwSRuTqQOIRN3Z6stSf4ISVWQnwRDDAaYfm8tj9xL6vbjXugQW9F++weMhO9gvyraDmJP/wlaCAdfgiXo/LjVneRQDBozUfPxF7KKBb8GTjP4PGILep3/n8HyxEl3ibAvgUplsdh5ybW2IeZeHwI9fuRY1EE09vGgIi7TSyHD3bfkNwQTsotNsgO3Z5SBPWPDIN2n0NYtVcUfkpJJZbp3TjWUhZuciHtsXggw4/aeW4xQdpNV,iv:LxoBD3dV1JLGJt8f8O70heIg+oVuSKrdLAv2AxFgfc0=,tag:79cQmt6gGuMO5cfYfeZ4HQ==,type:str]",
+	"sops": {
+		"age": [
+			{
+				"recipient": "age1g6y8gvcampqj5y3yzdajke2h5n7k6ckdg6a424cghy5325px7cmqjmmd28",
+				"enc": "-----BEGIN AGE ENCRYPTED FILE-----\nYWdlLWVuY3J5cHRpb24ub3JnL3YxCi0+IFgyNTUxOSBGTkZMQnZmelNKanJ4cjhu\nbGNDOENpOGoydWFFM21VNytYYkFabkE0WmdFCkNPb2ZyZHRxd2l0WnN3c24yNlZH\nRFp4ZStaY1JCUmFxL0xxVERjTk5yWW8KLS0tIE1KQURtbkl1Q0RROGZTZ2xMK0tI\nWlFQd2VFcmU5dC9FRXZ0cW1adDFCa0kK8gko5J+LsnVTuSj8yS60L05bYruuno9d\nUYtAHcfbnZ9VfrAFH+uWfsPUoloqDOiRR0BQx6m6epWlAIRILni2kw==\n-----END AGE ENCRYPTED FILE-----\n"
+			},
+			{
+				"recipient": "age1zy3q73pujauyajgfqwu0pnyy8732lzwvw87tu7p2xg3xuzaujc2qh6ql77",
+				"enc": "-----BEGIN AGE ENCRYPTED FILE-----\nYWdlLWVuY3J5cHRpb24ub3JnL3YxCi0+IFgyNTUxOSBEa2dHTWJ6RGVPTy9CRVdD\nN3dvcVd6RjRQdjJqdXlMdzNML25tYlpKTG1BCkR2ZUZqMHg2cG01UUNGOEttUTBM\nMVlpaUNTdEozd0MvN281QWczUEhLNHcKLS0tIFdGSG8vY3J1bktMM2tRekdmWFJJ\nNW5TaHNMVmc3Nm1OeE05Mk1xVVRxWFEKKpqi4WjKwb44Y3LrisJ0Nq5ftQljnrEN\nE/ardHaxYUCZaAuiBFSZeOG3+zrOc5+cNx74/ULAX4QaqHshJQpdKQ==\n-----END AGE ENCRYPTED FILE-----\n"
+			}
+		],
+		"lastmodified": "2026-04-20T17:57:27Z",
+		"mac": "ENC[AES256_GCM,data:Sc+5RNJuKJtsp9c22piVnUlUFvBeLGOKw1kwiyvUb48Hy9xVAP1YyzbopN7gVurdegoMvovz6iaM5pBC0xOlvGrHr6MvV5ET76N9hdacGCoFfSviKUQnDNQbic/yj9lJx5Nwpo05nf12R/NUCcXWCHkxv1jedpVRHclL8bEta5Y=,iv:WUVIqLnh81afVwdueOn59hK5+ijUI5iWrZKpqTLYSiM=,tag:I3uNmPwrnTbRWGDTBEjVRA==,type:str]",
+		"version": "3.12.2"
+	}
+}