Prevent pack file race condition during checkpoint sync#1024

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Commits on May 27, 2026

Gate tree-only fetches on filtered_fetches
pjbgf
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Remove shallow checkpoint fetches
pjbgf
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Unshallow filtered checkpoint fetches
pjbgf
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Disable auto-gc during fetches to reduce race risk
pjbgf
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Auto-unshallow any shallow checkpoint repo, not only filtered ones

Soph
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pjbgf
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Respect .git/shallow when walking checkpoint history for reconcile

Soph
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pjbgf
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Satisfy lint: wrap errors and annotate intentional os.Getwd / os.ReadFile

Soph
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pjbgf
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Always fetch-first in metadata resolution, even when filtered_fetches is off

Soph
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pjbgf
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Address code review: trim comments, simplify isShallowRepository, factor test setup

Soph
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pjbgf
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Scope shallow handling: opt-in via FetchOptions.{Shallow,Unshallow}

Soph
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pjbgf
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Don't --unshallow on push hot path: it's a global op, not ref-scoped

Soph
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pjbgf
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Fix tests
pjbgf
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