[snyaggarwal]

Part of OpenConceptLab/ocl_issues#3010. Follow-up to #980 and bd6b11a.

A collection version built with lock or latest evaluates its references uncapped (_async) and swaps HEAD rows for resource versions. A rebuild has to do the same to give the same members. Until now seed_children worked that out from the lock toggle and the expansion's autoexpand-<version> mnemonic, which goes wrong in two cases:

• Toggle turned off after creation: a lock/latest expansion rebuilt capped at 1,000 and kept HEAD rows, so its members changed.
• Toggle turned on later: every existing auto-expansion (all built with the toggle off) matched the mnemonic, so a rebuild once it's no longer the default would uncap it and swap its HEAD rows, changing its members.

Change: a nullable Expansion.built_with (lock, latest, or null), set when version create builds the expansion with that choice. A rebuild uses it in place of the toggle and the mnemonic: one built with lock/latest is rebuilt uncapped with HEAD rows swapped, whatever the toggle or default expansion is now; everything else rebuilds as before. The version's references are still swapped only when that expansion is the default.

Migration 0072_expansion_built_with: adds the nullable column, with no data migration. Existing expansions stay null, which is right for them: none was built through lock/latest (that path needs #980 with the lock toggle on, and the toggle is off in production), and marking them would change their rebuilds.

Tests:

• A lock expansion rebuilt after the toggle is turned off keeps its members past the cascade cap.
• An expansion built with the toggle off stays capped when rebuilt with the toggle on and another expansion as the default.
• The HEAD-swap test now expects a toggle-off rebuild to keep resource versions, and checks built_with is set.
• Both cases fail on master (bd6b11a).

pylint -j0 core/ exits 0; makemigrations --check finds nothing missing; collections, collection and value set integration, URL registry, sources and tasks suites pass (837).

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