docs: the front matter uses the vocabulary the structure check defines

`status: closed` is not one of `active | landed | superseded | abandoned`, so
both records declared no valid status and the index was stale. Both are
`landed`, and `.agents/docs/README.md` is regenerated.

Author: speak-agent

.agents/docs/2026-09-16-646-649-four-issues-by-home.md

@@ -1,6 +1,6 @@
 ---
 subject: triage
-status: closed
+status: landed
 ---
 
 # Four issues from a framework and an editor: #646, #647, #648 and #649, read against the engine and routed by home

.agents/docs/2026-09-16-646-649-implementation-plan.md

@@ -1,6 +1,6 @@
 ---
 subject: triage
-status: closed
+status: landed
 ---
 
 # #646 to #649 implemented: the plan, its review from eight angles, and the ledger

.agents/docs/README.md

@@ -62,8 +62,8 @@ Records that declare one. Everything else is listed by date below.
 
 ### triage
 
-- [#646 to #649 implemented: the plan, its review from eight angles, and the ledger](2026-09-16-646-649-implementation-plan.md) — active
-- [Four issues from a framework and an editor: #646, #647, #648 and #649, read against the engine and routed by home](2026-09-16-646-649-four-issues-by-home.md) — active
+- [#646 to #649 implemented: the plan, its review from eight angles, and the ledger](2026-09-16-646-649-implementation-plan.md) — landed
+- [Four issues from a framework and an editor: #646, #647, #648 and #649, read against the engine and routed by home](2026-09-16-646-649-four-issues-by-home.md) — landed
 - [Link forms, standard levels and a path limit: the asks of #641 and #642, read against the code](2026-09-15-641-642-link-forms-standards-and-paths.md) — landed
 - [#641 and #642 implemented: the plan, its review from eight angles, and the ledger](2026-09-15-641-642-implementation-plan.md) — landed
 - [#634 implemented across five repositories: the plan, its review, and the ledger that tracks it](2026-09-14-634-implementation-plan.md) — landed
@@ -76,8 +76,8 @@ Records that declare one. Everything else is listed by date below.
 
 ### 2026-09
 
-- [#646 to #649 implemented: the plan, its review from eight angles, and the ledger](2026-09-16-646-649-implementation-plan.md) — active
-- [Four issues from a framework and an editor: #646, #647, #648 and #649, read against the engine and routed by home](2026-09-16-646-649-four-issues-by-home.md) — active
+- [#646 to #649 implemented: the plan, its review from eight angles, and the ledger](2026-09-16-646-649-implementation-plan.md) — landed
+- [Four issues from a framework and an editor: #646, #647, #648 and #649, read against the engine and routed by home](2026-09-16-646-649-four-issues-by-home.md) — landed
 - [Link forms, standard levels and a path limit: the asks of #641 and #642, read against the code](2026-09-15-641-642-link-forms-standards-and-paths.md) — landed
 - [#641 and #642 implemented: the plan, its review from eight angles, and the ledger](2026-09-15-641-642-implementation-plan.md) — landed
 - [The build database of #636, and two defects on the way to the latest xlings](2026-09-14-636-build-database-and-the-latest-xlings.md) — active