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dalgo2memory: collection-group queries preserve the parent chain (#89)

A collection-group query (root collection ref) now returns records carrying
their FULL parent key — matching Firestore, where a collection-group result
carries the document's parents. Previously the memory adapter rebuilt result
keys as collection+leaf-id, dropping the parent.

Each engine (columnar, serialized) now records the stored record's full key
(the SQL "FK to parent" the caller passed at Set time) and returns it via the
row; query results use that key, and a parent-anchored collection ref filters
to that parent's direct children (isChildOf). keyID (the per-leaf-collection
storage id) is unchanged.

Tests: collection-group across parents preserves parents; parent-scoped filter;
helper branch tests. Package coverage: 100.0%.


Claude-Session: https://claude.ai/code/session_01RU2Ve3AvUPrGwQxebsdD2C

Co-authored-by: Alexander Trakhimenok <trakhimenok@users.noreply.github.com>
Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

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