It links module-versions to each other and knows nothing about nodes; which
machine runs what stays the control plane's (novox/hq ADR 0070, 0072). Keeping
them apart is what lets the control plane carry on composing declarations while
this is down.
The builder announces what it built, this places it in the graph and announces
what that means, and the control plane hooks the meaning rather than the build
output. A rebuild producing the commit already current is registered and is not
an upgrade — announcing it would ripple outward forever through modules that did
not change.
Ordering is not computed. Modules stale and waiting on nothing that is itself
stale are announced as buildable; the rest stay stale and appear once whatever
they were waiting for is registered, so a chain and a diamond need no special
handling and nothing holds a plan.
Four tools over the graph: what this mesh holds, one module in full, what a
change to a module reaches, and what must be rebuilt and why. The edges are
derived from builds rather than declared, so they cannot drift from what the code
actually uses.
Claude-Session: https://claude.ai/code/session_01D6qtiYU3P9jk3pnAXyAFyx
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