Close plan review: fix Decisions table 404 naming (content/404.md → content/_404.md), check off Verification items, log collect_items() quadruple-call as technical debt, fill in Retrospective. Fix post-changeset staleness: AGENTS.md YAML→TOML reference, add [nav]/[feed]/[sitemap] config tables to AGENTS.md example, mark charter workstream 1 complete.