A merge acted on late by the catch-up made its plan after the plan of the
merge that followed it, superseded it by creation time, and folded its
unbuilt modules into a plan at the older commit: on 2026-10-09 the
forge's security fix (a082615b) was superseded by 8ff8197a. A plan now
keeps its merge time (migration 0086), supersession follows it, and a
merge older than an open plan of its branch is planned at that plan's
commit, which contains it.
mesh/merge-gate pass: builds build-agent, mesh-controller, route-proxy → ace, g14, novox, shanks; no bus step; every machine composes with the change as it…
The node-engine's own since starts again at every restart, so an agent that
restarted the engine in a loop kept agent-can-become-root quiet for ever (the
review of 2026-10-09). The controller now keeps when it first saw the verdict
waiting for the setuid search (migration 0085), forgets it at the next
complete verdict, and raises once the engine's own bound has passed since;
the bound and the pending reason are read from mesh-host's rootsearch.
mesh/merge-gate pass: builds build-agent, mesh-controller, route-proxy → ace, g14, novox, shanks; no bus step; every machine composes with the change as it…
mesh/delivery covered: a later merge that contains it was delivered: novox/mesh-controller@eca6390d6fe4 (merged as 33dc85d8 into main, walk plan-17915444…
A source repository's name is not its identity, and a trunk anyone may push
to makes the trunk rule mean nothing (the review of 2026-10-09). Through any
verb a module now registers only from a repository on the mesh's forge whose
trunk refuses direct pushes, requires a status and lets no administrator
merge past one, asked of the forge's own tools; and only from the repository
by the forge's id, recorded at registration (migration 0084), so one deleted
and made again under the name is refused. The serving controller marks its
environment, so nothing it runs or starts reads as the terminal, and a
terminal request covers only the repository and path it asked.
An agent could make a repository of its own, or fork one the mesh builds
from, commit a module.json naming sudo or mesh-host, and ask the build verb
for it: the outcome was registered under that name, and the next push made
whoever wrote it root on every node (novox/hq ADR 0266 §7, the review of
2026-10-09). The trunk rule checked the trunk of the repository built, which
was the agent's.
The take-in, which every outcome reaches whichever verb asked it, now
registers a module only from its registered repository, and a new module only
from a repository the catalogue already builds from (a merge adding one);
anything else only when the build request was kept as asked at the
controller's terminal (migration 0084). Through a verb, a build of a
repository the catalogue builds nothing from is not asked at all.
On the control node every agent ran as the operator's account, which has
passwordless sudo, so an agent could become root without a person (hq ADR
0266). A node now names an agent account at the controller's terminal only;
the agent's module declares it never to become root, the node-engine judges
that, and the self-check (DA) raises agent-can-become-root while it does not
hold, so ADR 0259's router can rest on it.
mesh/merge-gate pass: builds build-agent, mesh-controller, route-proxy → ace, g14, novox, shanks; no bus step; every machine composes with the change as it…
Second review of #150: one key per machine and module let a newer failure
be cleared in the tick that raised it, pruning could orphan an open
condition, and a build no longer waited for read as never asked although it
may still run.
Review of #150: a withdrawal could land between the look and the act, a
failed ask read as a build in flight, a request kept the wrong asker, a
build being registered read as not built, build "true" could ask a build
nothing waited on, and a status read changed state. Claim a row under the
machine's hold before making it, keep a request only once asked, settle on
the controller's own tick, raise an assignment not made as a condition
until it is answered, and tie each row to its machine.
A merge asks for a new module's build, and assign answered "no module of that
name" until the build registered it, which read as a module nobody registered
(hq issue 325). Keep every build request, tell a build in flight, a module
known and not built, and an unknown name apart, and make an assignment made
while the build runs when the build registers the module.
A copied base was named only in what a build stood on, and nowhere when the build failed,
so the store's sweep could never let one go (hq issue 321). One repository per upstream
image stops each module asking the public registry for the same image again, and letting
an index go now takes its own platform manifests, which otherwise kept every byte. A
person can record the copies no record names through the new mirrors verb (hq ADR 0257).
The forge test fix is the same commit as on feat/plain-notifications: main fails without it.
mesh/merge-gate pass: builds build-agent, mesh-controller, route-proxy → ace, g14, novox, shanks; no bus step; every machine composes with the change as it…
A module's failed unit now arrives among its resources and raises the
module's own condition, named by the unit. The machine's own failed
units, which no module places, are one warning for the machine listing
them, cleared when none is listed. Nothing a send moved is among them,
so the gate never holds a send on that finding. The statement's units
are kept with the machine's health (migration 0080) and node show says
them.
token issue --overlay-key records the key the machine made, binds the
token to it, gives the machine its address and makes it a peer of the
hub, pushing the hub before the token is shown. The token carries the
hub's tunnel and the bus at its holder's address on the private network,
and enrolment refuses any other key (novox/hq ADR 0169). The bus is no
longer public, so a machine outside the mesh can join only this way; a
token without a key is still what the machine running the bus joins its
own mesh with. Also a token verb, which says it replaces running the
command by hand and adding a peer to the hub with wg.
mesh/merge-gate pass: builds build-agent, mesh-controller, route-proxy → ace, g14, novox, shanks; no bus step; every machine composes with the change as it…
Two incidents had one shape: a change took effect that nobody saw first (hq issues 241, 304).
Three guards, each silent when nothing is at stake:
- settings show [--history], and a set that answers each key it adds, changes and removes, and
refuses a removal unless --replace; the replaced or cleared layer is kept in settings_history,
in the same transaction as the write (migration 0078).
- every send keeps a summary of what it sent (no file content), plan <node> --diff compares with
it, and push with no machine is refused unless --all.
- a push that would give a running container's mount another host directory holds that machine,
naming the module, mount and both directories, until push <node> --move <module>; a named push's
cascade is held the same way.
Rebased onto main and fitted to it: the hold runs before the push says what it recreates, a whole
push still says so first and leaves machines waiting for a gate, the verb's push with no machine is
still --behind and a push still needs why. The verbs take plan diff, settings replace and history,
and push move beside a machine, each refused where it cannot take effect.
A VPN client rewrote the laptop's resolver file and nothing said so. The
engine now states its machine's networking; the controller keeps it with
the machine's health (migration 0077) and raises the rewrite as its own
finding naming the writer, the machine's own faults as machine.<m>.network,
and what several machines cannot reach once, there. The gate waits on a
rewrite it did not make rather than putting back a good build.
The gate judged a module by what the mesh saw from outside, so a container that
crash-looped after it applied passed it. Each machine's node-engine now states
the health of every long-running resource it runs; the controller keeps the
newest statement per machine, raises module.<module>.<machine>.unhealthy on the
second statement in a row, clears it on the first that does not say it, and the
gate passes a module only when every long-running resource of it is stated
healthy since the send. An engine that states nothing is judged as before.
While the mesh-delivery seat has a holder on record, a merge that moves no
core module opens its walk and asks nothing until mesh-delivery or a person
says go; nothing of it is registered before its turn, so no other send
carries it. The controller keeps the planner, the gate, sending and the
walk, and gains the verbs the owner asks with: delivery-plan, -order,
-check (a group composed as one future state), deliver, delivery-stop,
delivery-walks; every walk kept is said as plan-moved.
mesh/merge-gate error: the check could not run: a throwaway postgres:17-alpine could not be raised: docker run --label mesh.build=build-1791317509716888018…
An image is not byte-reproducible, so ADR 0236's 'same artifacts is no move'
never held for one: a catalogue merge that did not touch the bus rebuilt it,
and every send to the control node waited for a planned bus upgrade.
The builder now records a source fingerprint per build (module tree, context
trees, bases and toolchains by digest). A rebuild with the fingerprint of the
build it repeats is registered with that build's artifacts, handed to modules
standing on it, holds no push, demands no bus step, and a plan sends and
gates nothing for it. Identical artifacts remain a second way to be no move.
A send carries the machine's whole declaration, so at the switch to roll the next send of
anything would have carried the old default's backlog, unjudged, to every machine. A gated
send now carries and judges everything waiting on its machine; every other send is refused
or leaves the machine; a release plan walks what waits one machine at a time, the control
node last, and one that fails holds the next until a person releases it.
A build that reported applied was sent everywhere; one that then did nothing, served
no tools or broke its machine's word reached every machine. Now the first machine is
judged by the component's health (the core's definitions, as doctor probes H-*, or a
module's own) three times over two minutes within ten; a failing gate puts the previous
build back there once, marks the build, and says it as a condition and an event.
Upgrades roll out by default; the bus is a planned step; a module deleted at its
source is not built (the public-acme plan failure).
A walk over a large library every hour loads the array that protects it. An item now says how it
is measured — a bounded daily walk, a dataset's counters, or its top level only — and a size that
is a lower bound is kept as such and never read as a shrink.
A module's data section says what it keeps and how precious it is; the backup holder's lines,
binding stickiness, retirement on unassign and D13's conditions follow from it, so issue 273's
empty replacement is said and an unassigned module's data is remembered, not forgotten.
Issue 258's fix let a mesh seat's holder elsewhere answer before this machine's own provider. Right
for the resolver, which any provider answers alike; for the store's seat it re-bound every database
consumer on a machine running its own store to the holder on another, each was given a fresh, empty
database there, and nothing said so for twenty hours.
- An offer says whether it keeps its consumers' data (`keeps-consumer-data`); unsaid, a provider
that grants each consumer a credential does. For such a provision the seat's holder no longer
overrules a provider beside the consumer; a pin still does.
- Where each such consumer was sent is recorded (migration 0071). A resolution that would bind it
elsewhere keeps the recorded provider and says the move; one whose provider is gone is refused,
never answered by another.
- A push says a kept move and raises it as an urgent condition at once; the self-check's D12 raises
it every run, with a pinned move not yet sent as a warning and any unasked move as urgent.
Research 031 counted the repairs people made by hand: a push to unstick a
plan waiting on a report, a controller restarted to make an object again, a
plan closed, a consumer re-made from now. Each was the ordinary path taken
again by someone who noticed. The healer registry makes each a registered
response to one condition kind, with a budget, a settle and its event:
- H1 sent-not-reported: ask the machine's node-engine to report again
(mesh.node.<n>.ask.report); if it does not report what it was sent, send
it again, never moving a build a policy or a plan holds back
- H2 stalled: close a plan whose wait is superseded or finished
- H3 holder-silent / consumer-lost: the send's own assertion of the bus's
objects (issue 208's note)
- H4 consumer-behind: consumer-reset, only for a consumer the stream table
marks resettable (the controller's own events consumer)
- H5 is the identity provider's own repair (ADR 0224 §5), registered only
Success is the observation clearing the condition, never the healer; a spent
budget hands the condition to the operator, urgent, with what was tried, and
no healer touches it again. Every act is begun in the store before it is made
(migration 0070), kept in the condition's tried as "healer Hn" and said as
the seat event healer-acted; a heal is never a hand act. More than twelve acts
in an hour stop every healer until an hour after the last, said urgently.
Only the lease holder heals.
S15 is live: a cause repaired by hand twice in a fortnight raises
healer-wanted, naming the healer that was not enough where one exists. D6's
far-behind finding has its own kind, consumer-behind. Nodes are granted the
question; the controller's grant gains healer-acted (genesis lock in
mesh-host). `healers` lists the registry, the acts and the brake; status
counts the week's heals.
Two controllers could both act (issue 204), a reconcile's report could
overtake the apply after it and the digest decided (issue 267), and a grant
could make a second writer of a machine's report.
- The lease (internal/lease, ADR 0229): mesh-controller_lease key `holder`,
15 s age, renewed every 5 s by compare-and-set; the epoch is the revision
it was taken at. The gate is the clock (stops 3 s before expiry); a refused
renewal is a loss and the process exits; a holder that stops gives it back.
serve takes it before asserting the bus. Epochs kept in the store
(migration 0068 controller_epoch) as a floor: a bucket raised from nothing
is compacted past it. Unleased (no epoch, S12 urgent) only when nobody
holds it and the bus will not let it be written. A shell command acts
under the holder's epoch, or its own lease when none.
- Declarations carry `epoch` inside the signed envelope, only to a machine
whose latest account carried a report_sequence (mesh-host #35); would-send
is composed with the epoch last sent. Allot and the send both pass the gate.
- Reports: contract in internal/link/order.go (epoch, sequence,
report_sequence, older_than, refused_older). Accounts kept by epoch, then
sequence, then report sequence; older refused, counted; unordered reports
keep the digest rule. Plans by compare-and-set on a revision, with epoch.
Conditions and calls carry the epoch and are not written off the lease.
- S12 and S13 (naming the writer by epoch) watched, D5 run; reset of the
bucket said. Writers table compiled in and enforced in PermissionsFor; the
controller no longer publishes mesh.control.>. A contract per consumed
kind, and the empty-on-error lint over the repository.
- mesh-host pinned to its main with the epoch in the validator (D1 validates
the envelope as sent).
Needs mesh-host's genesis lock with the lease grant (mesh-host PR) for
TestTheInstallersFirstUserListIsWhatTheControllerWouldCompose.
A given own secret the module reads at start is held by nobody but that
module, so the mesh need not read it to replace it: secret rotate now
works on it, and a value given through secret accept is replaced on its
own after the module's first good start under the mesh. Only a value an
outside party issues (own-secrets "issued-by": "outside") or one the
module applies stays as given, refused with the reason.
A controller restart lost every call's outcome, `status` composed the mesh
while its caller waited (18.6s live on 2026-10-06, past the 10s window), a
repair by hand left no trace, and the core's bounds had nothing measured to
be set from.
- calls: kept in the controller's bucket mesh-controller_calls (last 1000 or
14 days, answers bounded to 64 KiB), read by id across a restart; a
controller starting marks a stopped one's running calls abandoned; each
call names its caller from the inbox its answer goes to.
- status: the serving controller composes it at start, after news from a
machine, a build or an acting verb, and every minute; the verb answers the
last composition at once with when and how long it took. Composing resolves
each machine once instead of twice.
- hand-act log in mesh-controller_hand-acts: push (required through the seat),
plans stop/close, broker consumer-reset and the new hand-act record take
--why/--cause/--condition; `hand-acts` lists them and repeated causes;
status counts the week's.
- durations (migration 0066): apply (send to first report), heartbeat gap,
plan tier and build, recorded as heard; `durations` summarises them.
- the controller's seat row takes this binary's definition of its own verbs,
so the console no longer judges calls against an older build's schema.
- the controller is granted its two buckets' subjects.
The identity provider failed every consumer for a day and status called the
mesh well (hq issue 179). The controller now follows every provider's
provisioner.failing/recovered, keeps the newest failing word per provider,
machine and consumer (migration 0065), and status, its JSON and node show
name it until it recovers. Every module that receives contributions is
granted the two events, so no manifest can forget them.
The seat now covers /etc/hostname too. The migration keeps the old name as
an alias so hosts, still assigned while machines move, holds the same seat.
Claims were compared by spelling, so the old and new module would both have
held it on one machine; they are now compared by the seat they resolve to.
The uplink's holder writes /etc/resolv.conf, so the seat that wrote it and
ADR 0220's dependency of it on the uplink have nothing left to say. The
migration deletes the store's row; nothing holds it once resolv-conf is
unassigned everywhere.
musl takes the first reply from any listed nameserver, so a public fallback
beside the mesh's resolver answered NXDOMAIN for mesh names in every Alpine
container (hq ADR 0223). The fix is two mesh resolvers and no public one, which
needs mesh-dns-resolver held on two machines: a seat can now be replicated,
each holder recorded by 'seat <name> --add', checkClaims accepts every holder
on record and still refuses a second holder of any other mesh seat, a holder
answers its own requirement, and a roster fact gives each replicated seat's
holders, this machine first, so resolv-conf can list them. Migration 0062 keys
a holding by seat and assignment.
A named push flushed every other machine whose declaration differed from
what it was last sent (hq ADR 0083). Under an upgrade policy of `record`,
or a plan still waiting on its first machine (ADR 0218), every machine
running the module differs, so `push <one>` sent the held build to all of
them (hq issue 259).
Each send now records which build of each module it carried
(node.sent_builds, migration 0061). The cascade, and the bus holder added
to a named push, skip a machine any of whose modules would move to a
build its policy records or an open plan has not sent it, and say which
module, which build, why, and that `push <node>` sends it. A machine
whose last send was not recorded is held until it is named. The named
machine itself, a whole-mesh push and `push --behind` are unchanged.
Nothing has claimed node-dns-resolver since the mesh moved to one resolver
(hq ADR 0194); seeding never removes a row, so a migration deletes it.
resolv.conf stays the mesh's only while the network manager is told to keep
off it, which the node-uplink holder does (ADR 0117). A seat's Needs makes
that a dependency checked at assignment by the ADR 0207 mechanism (hq ADR
0220). The two-claimants test keeps its intent with a synthetic module now
that resolved-split-dns leaves the catalogue.
Grants first could hold back the very declaration that lets the controller
issue them. The holder now goes first, then buckets and memberships, then
the rest; a membership that fails holds back only its own machine, and an
announcement whose send stopped at its grants is asked again. Whether the
holder must go first is read from a digest of the user list it was last
sent, not its whole declaration. Migration renumbered to 0058.
A merge planned without looking at open plans, so two plans worked the
same modules and a stuck plan stayed open for ever. The newer plan folds
in what older plans of the same repository and branch had not built or
sent, and closes them as superseded. A person can close a stuck plan by
id with `plans close <id>`.
The bundles refactor took ADR 0188 on main, so this work's record is 0201 and
every comment citing it moves with it. Main also took migration 0055 (an
older build never replaces a newer), so the store's collected-artifacts table
is 0056 — a number two migrations share is a schema nobody can trust.
make check passes except TestTheResolverIsToldEveryMachineOnTheNetworkAndToldAgainWhenOneLeaves,
which fails on main too and now for two stacked reasons (hq issues 203 and 202).
The mesh names what may go from its own build records — a digest it did not
record making is never named, which is what keeps the sweep away from the
images genesis pushed. An artifact stays because a definition the mesh holds
names it, or because it belongs to one of the five most recent successful
builds of its module.
internal/artifacts asks the store to let go of one; internal/inventory
decides and remembers (migration 0055); the sweep runs after a build the mesh
recorded, which is when both the bytes and the keep set moved. Never fatal to
a build.
And the manifest side of while-stopped, refused from the definition alone:
no schedule, run-once, a container the module does not declare, itself.
Builds of one module in flight together finish in any order, and the mesh
took whatever it heard last as what the module is: RegisterModule overwrote
the module's manifest unconditionally, and Held/BuiltAgainst/ReadRepositories
ordered builds by when they were recorded. A postgres build asked before the
mesh-tools runtime fix finished after the one asked after it, and the next
push deployed the stale image (novox/hq issue 219).
A build is now ordered by when it was asked, read from the build-<nanos> id
the controller writes: build.asked and module.built_asked (migration 0055).
A registration from an earlier request than the module's current one is
recorded and refused as superseded. A plan takes as its outcome only a build
asked at or after its own ask, so an earlier plan's leftover build cannot
settle a later plan. Ids of any other shape keep the old order.
A host reports every table and chain that refuses traffic with its owner,
and a converged machine's found firewall's state. The controller keeps both
on the node's record (migration 0054), shows them on node show, names every
converged machine something other than the mesh filters in status — text
and JSON, and such a machine is not well — and the converge preview lists
what filters the machine with the fate of each: retired with the front end,
left as the runtime's, left as a ban, or left in force and not the mesh's.
What was invisible for eleven hours (issues 144, 145) is said by name.
The host now reports, for every held thing, the facts a take compares; the controller keeps them, and
take puts them beside what the module declares — the found image and its age against the declared one,
the found networks and who else is on them, ports and mounts, a found file's difference from the
declared content — and refuses a downgrade without --downgrade and a differing file without --replace
<path>. Without --yes the comparison is printed and nothing is taken. node show lists the facts and
the strays the machine reports. build and the daemon's take-in say when a module's policy rolls the
result out at once. The own-secret refusal points at the provider form for a required secret.
A module's dependencies are one relation in the catalogue — stands-on, packages, built-by, declared —
answered by one call. A merge takes what moved and everything reachable from it, sorts the set into
tiers (a code dependency in the same tier, a build dependency after its base is built, a runtime
dependency after the build machine is built and running; the build machine's own base comes first,
built by the one that runs), writes the plan to the store, asks the first tier and returns. Every
outcome advances the plan; a ticker advances what outcomes cannot; a controller replaced mid-plan
resumes it. status lists open plans and names one that has waited too long.
A provider is a (node, module) pair (design 23), and the pin — the one way a
consumer names its provider — named only the node. Two modules on one node
can both answer a provision (public-acme and step-ca both offer acme-ca on
novox), and then the resolver, given a pin naming that node, took the last
provider listed: a coin flip. The same ambiguity beside the consumer was
settled by a map walk — random per plan — which is how novox's own
route-proxy got its issuer (novox/hq #258).
- `pin <node> <provision> <from-node> <module>`: both halves, always. The
console gains `pin` and `unpin`. The provider may be on the consumer's own
node, since two modules beside it can both answer.
- The resolver refuses ambiguity instead of picking, across machines and
beside the consumer alike, naming every candidate as node/module and the
form of the pin that settles it. A plain capability that grants nothing
and serves nothing (three shells beside an editor) is not a choice to put
to anybody and stays as it was.
- provision_pin gains a nullable module (0050); records made before are
completed where the node they name answers once, and left for a person
where it answers twice (0051).
- The provider of something already satisfied is looked for among what was
assigned, not only what the walk has reached — a consumer reached before
the provider beside it no longer loses its binding.
- The start-time check that every declared verb is runnable samples each
verb's required arguments from its schema instead of three guessed keys.
Live consequence: a node that has two providers of one bound provision
assigned (novox: acme-ca) resolves only once pinned —
`pin novox acme-ca novox public-acme`.
An offer may say `"credential": {"own": "<secret>"}`: the provider's own secret is the credential
every consumer of that provision receives, in the shape of a pair credential. The vault keeps one
value, sealed to the provider, to every consumer that holds the provision and to the operator, all
under one generation stamp; a consumer binding later, or `secret rotate` on the provider's secret,
makes a fresh value and seals it to every holder in one act, and the rotate command sends every
holding machine together. An accepted value is sealed to the consumers of the moment and never
remade: a consumer binding after it is refused with the way out (ADR 0113). The named own secret
must say how it is taken (issue 180), so the provider's start applies the file.
A need carries the shared secret's name from either side of the machine boundary; the plan mints a
consumer's copy from the provider's value. Registered manifests keep their bytes.
A controller whose defaults carry the new name seeds it before the migration runs, and the first
form renamed into a duplicate key; the control node's prepare failed on every attempt (2026-09-30).
If the new row exists, the old row's holding moves to it and the old row goes; otherwise it is
renamed. The old name becomes an alias either way.
ADR 0121 decided it and deferred it as a delivering-seat migration; ADR 0122's aliases made it one
update and one alias (migration 0048). The former name resolves to it forever (novox/hq ADR 0156,
issue 123).
A seat's protocol lives in the store (migration 0047; seeded additively), a served verb carries its
description and schema, holding a mesh seat requires serving its verbs, a node-scoped seat's tool
carries the node, and the control plane serves status, nodes, node, modules, seats, builds, plan,
assign, unassign, push, build and tools on its seat by running the same commands (novox/hq ADR 0132,
ADR 0154, design 33). A grant of * reaches a role's tools; seat:<seat>.<verb> grants one.
novox/hq 04-ISSUES/107. The controller already held a per-node lock while
it composed and recorded each send; the order existed and was thrown away
at the wire. Each send now takes the next number for its node, one
higher than the last, under that hold and before the body exists — so
the number is inside what the mesh signs, and a replayed older
declaration cannot borrow a newer one's.
Zero is not sent. A host reads absence as "no order claimed", which is
the shape of every declaration before this, so nothing that worked
before changes for a machine sent nothing since numbering existed.
One subtlety, and it is the one that would have read every machine as
behind for ever: the mesh decides a machine is behind by comparing the
digest of what it WOULD send against what it DID send, and a number
changes the bytes. The read-only comparison composes with the number the
machine was LAST sent, not a fresh one, so it is byte for byte what was
sent when nothing else changed.
Hosts went first and every machine runs one that understands the field.
novox/hq 04-ISSUES/087. A host refuses a declaration carrying a field it
does not know, and refuses it WHOLE — deliberately, because that keeps a
half-understood declaration off a machine. It makes every new declaration
field a flag day: hosts first, then the controller. The mesh had no record
of which host any machine ran, so that order was kept by somebody
remembering it, and a machine that refused for this reason reported a
failure with nothing saying why.
The machine has reported its host version since ADR 0141. The
controller's own copy of the report did not have the field, so it was
unmarshalled into nothing and thrown away on arrival. It has it now,
records it, and shows it in `node show` — "not reported" rather than
blank, because a machine that has not said is not a machine running
nothing.
Status says which machines run an older host than another machine does,
and which is newest. Deliberately disagreement rather than staleness:
nothing delivers a host version yet (ADR 0141, accepted and not built), so
the mesh holds no canonical current version and cannot honestly say a
machine is behind THE host. What it can say is that the oldest host in the
mesh is what the mesh may send.
A machine that has reported nothing is left out rather than called
behind. Versions compare as strings, which suits the timestamps and
commits this mesh uses and is wrong for a scheme where "10" sorts before
"9" — said in the code, at the place that would have to learn.