fix: read-only Codex sandbox with unified diff file fallback for oversized diffs#620

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wesm wants to merge 11 commits intomainfrom

fix/codex-sandboxing

Commits on Apr 5, 2026

fix: use read-only sandbox for Codex reviews with diff file snapshots
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refactor: unified diff file fallback for all agents

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refactor: rename Codex-specific placeholder and prebuilt helpers

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fix: platform-neutral diff file reference, retry on snapshot failure

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fix: only write diff snapshot when truncation is detected

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fix: preserve Build() compat for non-worker callers, fix prebuilt degradation

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fix: strip both full and compact diff-file fallback variants

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fix: hard-fail prebuilt prompts on snapshot failure, delete stripDiffFileBlock

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test: end-to-end diff snapshot integration tests

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test: tag snapshot integration tests with //go:build integration

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test: move Kilo and OpenCode agent tests behind integration tag

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