The lean-build endgame: a site ships carrying only the plugins it chose.
- scripts/build-site.sh: reads a site profile, resolves the hard-dependency
closure from manifests, builds the frontend with SITE_PLUGINS (stage-frontend
carries only those plugins), and stages a backend tree of core + only the
chosen plugin dirs. An unchosen plugin is in neither the bundle nor the tree.
- Core lazy-import guard: `flask seed demo` hard-imported the 5 asset subtype
models, which would crash a lean build missing any of those plugins. Now
guarded (a missing model skips its demo section).
- test_lean_build_guards.py: statically asserts NO core (shopdb/core, shopdb/cli)
import of a plugin is unguarded - a lean build omitting that plugin would
otherwise crash. 0 unguarded today.
Pilot verified: a lean build (machines + printers) carries only machines +
printers code - PartsKiosk / ManifestEditor / USBLabelBatch / KnowledgeBaseDetail
/ EmployeeDirectory are absent from the bundle, and only machines/printers plugin
dirs stage into the backend. (Sidebar labels for absent plugins remain - the
accepted small plugin-aware core remainder.) Guard test + naming green.
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