Align the shared naming checker with the Human-directed PR-only attribution policy. Preserve visible PR provenance, naming, tracking, current identity exemptions, available base/head commits and nonempty-range validation without inspecting commit messages.
Verify Human and named-Agent callers against legacy, plain, malformed, misplaced and nonfinal commit trailers; retain missing/malformed PR attribution and invalid-range rejection. All 79 offline contract tests, shell syntax and whitespace checks pass.
Ticket: https://agenthub.fritzlab.net/t-d12vqnp63v5d
Policy decision: websites/docs.fritzlab.net#454 (comment)
dfritz