chore: sync integrated refused-origin parent into Max-Forwards lane

[seonghobae]

Parent-sync repair for #106. GitHub initially reported the reverse sync non-mergeable because CHANGELOG.md / TEST_STRATEGY.md had valid concurrent child and parent edits, so no automatic conflict resolution was accepted.

The parent delta was then inherited through ordinary/non-force manual composition on the #106 branch: two-parent commit b9dbbfe33d75b3799d4fa490a3ebde4ded6df597 records previous child exact 40dd054df368b141d7a9d15224aaecdd91415805 plus integrated parent 40e10607601bf9722d642d4a4bb18f02806c20cc; the #119 refused-origin fixture was inherited unchanged; CHANGELOG.md and TEST_STRATEGY.md were semantically composed rather than choosing either side wholesale. Because that merge commit made the parent head an ancestor of the child base, GitHub records this parent-sync PR as merged at b9dbbfe....

Current #106 exact dbecf6e43372e52d8af46e734fb74df83d63399d has merge-base exactly 40e106..., behind 0, and its effective delta against the live parent is again only the ten Max-Forwards-owned paths. No force-push, destructive rebase, self-approval, gate weakening, release, or cutover claim.

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