on deploy, one agent whose agent-configs repo has no commit on main is
skipped and logged instead of failing the whole internal/meta render, so the
other agents' pin moves go through. the controller reads each config head
from main, the branch hive-c0re compares against, not the repo's default
branch.
The swarm controller offers its own running rev (services.hyperhive.c0re.
hyperhiveRev) as the hyperhive pin of internal/meta and takes it only when
the forge compare API shows it descends from the committed pin; merges to
hyperhive main no longer move the pin, and the first commit pins main's head.
When a commit moves the pin, every placed agent gets a TriggerDeploy.
A deploy after a meta update no longer waits on it succeeding (after_any), so
a down builder does not hold back hives that render locally.
A new update_meta node renders internal/meta's flake.nix with
hive-meta-flake, the renderer hive-c0re uses: hyperhive pinned to its
forge main, each custom agent a hive places pinned to its agent-configs
main, all over https, and the swarm-wide values from
SWARM_CONTROLLER_META_FLAKE (set by swarm-controller.nix from
services.hyperhive.swarm.*). The swarm builder locks it, and the
controller commits flake.nix and flake.lock in one commit and gives
every hive's forge account read on the repo. A render equal to the
committed flake.nix sends no lock and commits nothing.
It runs at start, when hyperhive's main moves, before the deploy of a
merged config PR and before the first deploy of a new agent; those
deploys now wait for it. agent_web_port moves into hive-meta-flake so
both callers compute the same port; hive-c0re re-exports it.
On deploy: internal/meta appears on the forge and follows every merge.
No hive builds from it yet.
Refs #4857
