release: 1.3.1

Close Unreleased for retry-policy panel, persistent queue, and self-contained backups; pin compose and docs to 1.3.1.

Co-authored-by: Cursor <cursoragent@cursor.com>

docs/plans/inbound-relay.md

@@ -3,11 +3,10 @@
 **Status:** agreed  
 **Version:** target bump **1.x** MINOR; **`2.x` possible** — to be settled once
 the implementation lands (do not fix a major in advance).  
-**Order:** the 2026-08-13 full-tree review follow-ups are closed (CHANGELOG
-`[Unreleased]`), so this is next up as the largest remaining 1.x+ **feature**.
-The domain-admin role
-and `internal/web` split have shipped — see [CHANGELOG](../../CHANGELOG.md)
-`[1.2.0]`.
+**Order:** queue-retries shipped in `[1.3.1]`; this is next as the largest
+remaining 1.x+ **feature**. The 2026-08-13 full-tree review follow-ups closed
+in `[1.3.0]`. The domain-admin role and `internal/web` split have shipped —
+see [CHANGELOG](../../CHANGELOG.md) `[1.2.0]`.
 
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