Slurm in the first install: server init --slurm, and slurm.all_nodes

The choices screen has a Slurm part, and --slurm writes slurmctld on this
machine's node and slurmd on every node, those that join later too, into
server.yaml. slurm.all_nodes (ctl slurm setup --all-nodes) takes the nodes
from the leader's inventory. No node is lent at install.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

docs/reference.md

@@ -406,6 +406,7 @@ rather than repeated.
 | `cluster_name` | `string` | [SlurmSettings](#slurmsettings) |
 | `controller` | `string` | [SlurmSettings](#slurmsettings) |
 | `nodes` | `[]string` | [SlurmSettings](#slurmsettings) |
+| `all_nodes` | `bool` | [SlurmSettings](#slurmsettings) |
 | `lent` | `[]string` | [SlurmSettings](#slurmsettings) |
 | `partition` | `string` | [SlurmSettings](#slurmsettings) |
 | `dir` | `string` | [StrataConfig](#strataconfig) |
@@ -3525,6 +3526,13 @@ GPU, and need not be one of Nodes.
 Nodes are the llmgw nodes that run slurmd. Each stays llmgw's, drained
 in Slurm, until it is also in Lent.
 
+### `all_nodes`
+
+`bool`
+
+AllNodes runs slurmd on every llmgw node, those that join later too,
+besides any named in Nodes. Each is llmgw's until it is lent, as any.
+
 ### `lent`
 
 `[]string`