This fifth slice of #241 applies deterministic admission rules to classified conversation excerpts. It plans thread events for questions, choices, stances, withdrawal, and reopening, while preserving exact source attribution and returning review outcomes for unsupported or ambiguous candidates. Explicit option lists are admitted together or held for review.

Policy validates against a working snapshot and returns events plus diagnostics. It does not persist events, change the document, or perform human Save. Interpreter orchestration follows in the next layer.

**Review scope:** 106 files; 2,443 source lines and 7,461 test/helper lines, above the question-context layer. Tests exercise accepted and rejected transitions, source boundaries, capacity, and candidate interaction; artificial callback-failure cases have been removed.

**Validation:** 360 focused tests pass (1,890 assertions), along with full workspace/E2E types, formatting, and repository checks.

Independent review caught partial extraction of a four-option list; the included regression now requires a review outcome when only one or two candidates are supplied for a complete three- or four-option list.