The compiler that silently skipped thirteen files

The script that compiles context for other tools was skipping thirteen source files. Not failing on them - skipping them, without a warning, for long enough that the compiled output had drifted into contradicting its own sources.

The visible symptom was a downstream tool confidently stating a price for something that does not exist, because it was reading a stale compiled copy rather than the corrected source.

Two copies of one fact is the drift mechanism. A compiler that can drop inputs without saying so is the same defect with an automation step in front of it, which makes it harder to notice and easier to trust.