Validated in a combined 4-PR batch worktree off release/v3.8.51 tip (last of the Bun-native cluster; conflicted against the already-merged #11482's Dockerfile.bun hunk in the shared worktree — resolved by taking this PR's configurable ARG/ENV shape, which is exactly what it's designed to replace, and pushed the same resolution to this branch).
- Focused test: resolve-next-build-bundler-flag.test.mjs — 3/3 pass, part of batch's 5/5 node:test run
- typecheck:core, file-size, changelog-integrity, complexity, cognitive-complexity — all OK
- Full-repo lint: 228 pre-existing dashboard react-hooks/* findings, unrelated to this diff
Thanks for validating with both node --test and bun test — good practice given the dual-runtime surface this touches.
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