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feat(#2476): grow the meta-update cascade in-DAG instead of child DAGs

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MetaLock's non-sweep completion now grows one rebuild subgraph per
affected agent into the same DAG (append_subgraph), replacing the
fan-out-child-DAGs + cancel_children dance. Drops NodeOutput.fanout and
scheduler's fanout_specs. meta_update DAG carries Rebuilding transient so
each cascade agent gets crash-watch suppression at Swap (the property the
old child Rebuild DAGs held via their own transient); MetaLock head needs
no lease so the pseudo-agent gets no pill.

append_children/parent_id and child-DAG tests are intentionally left for
the #2453 capstone.
This commit is contained in:
atlas 2026-07-15 18:56:40 +02:00 • committed by mara
commit 2b3130f63c
5 changed files with 102 additions and 66 deletions
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16
hive-c0re/src/job_queue/templates.rs
View file

@ -186,10 +186,16 @@ pub fn perm_change(agent: &str, source: Source, reason: String, payload: PermPay
}
}
/// Meta-input lock bump. Child `Rebuild` DAGs fan out on completion —
/// appended *after* the bump lands so their prebuilds run against the
/// post-bump lock (and so a failed bump simply fans out nothing,
/// replacing the old pre-enqueue + `cancel_children` dance).
/// Meta-input lock bump. The `MetaLock` executor grows one rebuild subgraph
/// per affected agent into *this same* DAG on completion (via
/// `append_subgraph`) — appended *after* the bump lands so their prebuilds
/// run against the post-bump lock, and a failed bump appends nothing
/// (replacing the old fan-out-child-DAGs + `cancel_children` dance).
/// `transient = Rebuilding` because those appended subgraphs are rebuilds:
/// it's applied per-agent at claim time (the `MetaLock` head needs no lease,
/// so the "hyperhive" pseudo-agent gets no pill), giving each cascade agent
/// crash-watch suppression during its `Swap` — the property the old child
/// `Rebuild` DAGs carried via their own transient.
pub fn meta_update(
inputs: Vec<String>,
source: Source,
@ -204,7 +210,7 @@ pub fn meta_update(
approval_id,
inputs,
perm_payload: None,
transient: None,
transient: Some(TransientKind::Rebuilding),
nodes: vec![node(
"hyperhive",
NodeKind::MetaLock {