Why: downstream parsers are unreachable through the Host handle and the base lacks xlsx/pptx parsers; MS1 needs both. The snapshot also missed interface methods, so adding one was undetectable.
Evidence: request follows compat-policy sect.6 four elements; behavior contract and limits in the proposal body (documents has no CI; verified via git diff --check recorded on the Dev task card).
Impact: docs only; compat-policy sect.3 gains one sentence, usage.md format list gains xlsx/pptx.
Refs: docs/proposals/2026-10-06-ext-5-host-parse-document.md
Why: T2-T4 changed the interaction foundation (pure-inbox rail, four-entrance command bus, overlay workspaces) and the guide still described the classic tabs; T5 acceptance also requires the verification record with the zero-page walkthrough.
Evidence: zero-page walkthrough 12/12 PASS on a fresh real binary (fresh data dir: empty instance -> project/conversation -> slash commands -> #upload card lifecycle -> card action receipts -> tidy -> HITL block+resolve -> button-entrance dispatch -> plugin workspace declaration -> artifacts -> four-entrance audit); StatusLamp shape+color dual encoding asserted by ui suite; combo make test at pinned heads.
Impact: usage guide sections 4.2-4.7/5/6.2/7 rewritten; new T5 record; no code change.
Refs: docs/proposals/2026-09-30-ui-inbox-command-workspace.md T5; task card feature/polish-r1
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