The node-engine fills ${config:} only in files, unit names, owners and groups, never in a
process's environment, so MESH_CONFIG_CALLERS was never set and design 51's defaults always held.
The tools bundle now reads `callers` through stdio.Config on each call (holder.ConfiguredCallers,
Verbs.WithCallers per call); the program, which has no runtime resolving config, asks its own
tools bundle's new registry_callers on each wake of the windows (manifest invokes). The
environment variable is gone.
Claude-Session: https://claude.ai/code/session_01JG73KJNrH5EgFXMKKYSrig
The verbs answered the holder's own shapes (missing and ended, a part named digest, versions as bare strings, held as
the publish's event) while the seat definitions, now generated into mesh-contracts, name lacks and held, part,
versions of artifacts, tags with digests and a hold's own body. A build module using mesh-sdk's parts helper would
have read no lacking part and sent nothing. The bundle now takes and answers the contract's types and says each
event in its body; an image's manifest is the part whose digest is the publish's, as the contract names no media
type, and a hold on the image seat is of a copied base.
Claude-Session: https://claude.ai/code/session_01JG73KJNrH5EgFXMKKYSrig
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