The guard asserted EXACT completeness over a population enumerated by a directory
walk, so an untracked .ts/.tsx under web/src/ entered it and failed as unregistered
on that developer's checkout while CI — which only ever checks out tracked files —
stayed green.
The glob still supplies file CONTENT; the POPULATION is now the git index, read by
web/vite-plugins/trackedSourceFiles.ts in Vite's own Node context and handed to the
app project as a virtual module. That reaches the index without admitting
@types/node to tsconfig.app.json, the obstacle that deferred this in #818.
Three mechanisms carry the proof, each added because the previous was measured
insufficient: a closed-form restatement of the shared scope predicate (sharing no
helper at any depth with what it checks); a second independent `ls-files --others`
query cross-checking the population; and real-git tests that execute the derivation
against a temp repository.
Six residuals are stated with their MEASURED fail-directions, and
testing.guard-derives-population-from-source gains a bounded exception plus the
closed-form criterion.
fixes#819
Co-authored-by: Timothy <timothy@noreply.gitea.tblindustries.be>
