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[file.utils] add preflight_source_aware

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Jan Petykiewicz 2026-07-14 19:18:46 -07:00
commit 95e54acf96
5 changed files with 298 additions and 35 deletions
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masque/library/overlay.py
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@ -214,9 +214,8 @@ class OverlayLibrary(ILibrary, IMaterializable, IBorrowing):
"""
Mutable overlay over one or more source libraries.
Source-backed cells remain lazy until accessed through `__getitem__`, at
which point that visible cell is promoted into an overlay-owned materialized
`Pattern`.
Source-backed cells remain lazy until accessed through `__getitem__`, which
persistently materializes a detached, overlay-owned `Pattern`.
Source libraries must remain open and must not be mutated after they are
added. The overlay borrows each source and snapshots its names, hierarchy,