Reject unfinished pagination before reporting resolved review threads #358

🤖 Generated by the Agentic Engineer

Problem

The unresolved-thread helper reports unresolved=0 total=1 with exit 0 when its last page still says hasNextPage: true. Matching the total does not prove that the page chain completed.

Reproduced against current main 3538221 using the shipped public command and an isolated offline fixture.

Proposed direction

Require valid pagination metadata, intermediate continuation, and a terminal final page; return UNKNOWN for a missing, malformed or unfinished chain.

Acceptance criteria

• A complete one-page and multi-page response still counts correctly; unfinished and malformed page chains return exit 2.
• Add a failing regression first, preserve valid behavior, and verify the merged public command.

Size: S. Part of #38.