docs(changelog): stamp #3987 v2 (reload-before-save) as v0.51.398 (Release NK)

CHANGELOG.md

@@ -3,6 +3,12 @@
 
 ## [Unreleased]
 
+## [v0.51.398] — 2026-06-13 — Release NK (auto-generate titles for imported CLI sessions, #3987)
+
+### Fixed
+
+- **Imported CLI/external sessions now get a generated title instead of a raw id or placeholder (#3987).** When a session is imported without a WebUI title, the backend runs the existing `generate_session_title` path (reusing `_looks_like_default_cli_title` detection). The async title persist re-resolves the **latest** canonical session under `_get_session_agent_lock(sid)` immediately before saving (preferring `SESSIONS[sid]`, else `Session.load(sid)`) and re-checks the default-title guard on that latest object — so a WebUI reply that lands while title generation is in flight is never clobbered by a stale pre-generation snapshot. Manual regenerate still works. (#3987)
+
 ## [v0.51.397] — 2026-06-13 — Release NJ (wire /credits through WebUI command dispatch, #4071)
 
 ### Fixed