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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>