refactor(#2897): carry the meta-update inputs on the MetaLock node

Second of the `Dag` field removals, and the same shape as the first:
`DagSpec`/`NodeKind::Dag` carried an `inputs: Vec<String>` that exactly
one node ever read. Both reads live inside `run_meta_lock` — the
`meta::lock_update` call and the `meta_update_cascade_agents` fan-out —
so the list now rides `NodeKind::MetaLock` itself.

The executor stops touching `Claim` for this node entirely: its dispatch
arm already destructured `MetaLock { sweep, fanout }`, so `inputs` joins
them and the `claim` parameter, which had no other use, is gone.

Falls out of that:
- `Claim::inputs` and `DagMeta::inputs` delete.
- `dag_view`'s DAG-level projection onto the `MetaLock` node reads the
  payload instead. The wire `NodeView::inputs` is unchanged: still
  populated on the `meta_lock` node alone.
- the boot sweep names no inputs (it bumps `hyperhive` alone via
  `lock_update_hyperhive`), which the construction site now says out loud
  rather than leaving implicit in an empty DAG-level field.

Checked with clippy (`--all-targets -D warnings`), `cargo test -p
hive-c0re` (320 passed) and `nix fmt`. No option surface is touched, so
no nix-eval gate.

hive-c0re/src/job_queue/mod.rs

@@ -70,7 +70,6 @@ pub struct Claim {
     /// The agent this node targets (its own, not a DAG-level field). Empty for
     /// the agentless [`NodeKind::MetaLock`] + [`NodeKind::Dag`] container nodes.
     pub agent: String,
-    pub inputs: Vec<String>,
     /// Transient pill kind for the lease window (from the spec). Whether the
     /// pill is currently shown is derived from live lease ownership
     /// ([`JobQueue::held_transients`]), not a per-claim edge.
@@ -93,7 +92,6 @@ struct DagMeta {
     source: Source,
     reason: String,
     transient: Option<TransientKind>,
-    inputs: Vec<String>,
     created_at: i64,
 }
 
@@ -218,7 +216,6 @@ impl JobQueue {
                     source: spec.source,
                     reason: spec.reason,
                     transient: spec.transient,
-                    inputs: spec.inputs,
                     created_at: now_unix(),
                 },
                 Vec::new(),
@@ -304,7 +301,6 @@ impl JobQueue {
                 node_id: id,
                 kind,
                 agent,
-                inputs: meta.inputs,
                 transient: meta.transient,
             });
             // `started_at` is stamped on the graph `Node` by the scheduler's
@@ -481,7 +477,6 @@ impl QueueInner {
             source,
             reason,
             transient,
-            inputs,
             created_at,
         } = &self.sched.graph().node(container)?.payload
         else {
@@ -491,7 +486,6 @@ impl QueueInner {
             source: *source,
             reason: reason.clone(),
             transient: *transient,
-            inputs: inputs.clone(),
             created_at: *created_at,
         })
     }
@@ -549,10 +543,9 @@ impl QueueInner {
                 NodeKind::DeployWindow { approval_id, .. } => Some(*approval_id),
                 _ => None,
             };
-            let inputs = if matches!(node.payload, NodeKind::MetaLock { .. }) {
-                meta.inputs.clone()
-            } else {
-                Vec::new()
+            let inputs = match &node.payload {
+                NodeKind::MetaLock { inputs, .. } => inputs.clone(),
+                _ => Vec::new(),
             };
             let build_log_id = self.node_rt.get(&id).and_then(|r| r.build_log_id);
             // `node.parent` is the structural jobq parent. Top-level nodes