chore: converge #985 onto #983 exact parent

[seonghobae]

Lossless non-force descendant convergence for #985. Base is the #985 successor branch; head is current #983 product parent 45fc14629ffd4b27d6b969f01fabf8ffe0b2e991. This PR exists only to obtain an ordinary two-parent integration commit while preserving both the successor's five-path delta and all newer #983 Customer Master/PostBody repairs. No acceptance or release claim.

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