Release NY (v0.51.412): stamp CHANGELOG for #4148 (gateway reasoning previews) + #4184 (regenerate-title CLI/TUI sessions)

CHANGELOG.md

@@ -3,6 +3,13 @@
 
 ## [Unreleased]
 
+## [v0.51.412] — 2026-06-14 — Release NY (gateway reasoning previews + regenerate-title for CLI/TUI sessions, #4146/#4183)
+
+### Fixed
+
+- **Gateway-routed chat now surfaces reasoning/thinking previews in the WebUI (#4146).** When chat is routed through a running Hermes Gateway, reasoning fragments streamed by reasoning-capable models (`delta.reasoning_content`) now appear as a thinking preview, matching the non-gateway streaming path. Only string reasoning fragments are forwarded (structured payloads are never stringified into the browser), inter-delta whitespace is preserved, and the accumulated reasoning is persisted onto the saved assistant message so it survives a transcript reload. (#4146)
+- **Regenerating a title now works for CLI/TUI sessions that exist only in `state.db` (#4183).** The `/api/session/title/regenerate` endpoint previously used a sidecar-only lookup, so CLI/TUI sessions without a materialized sidecar JSON returned "Session not found". It now materializes a writable sidecar from `state.db` (the same pattern rename and archive use) and returns a clear 403 for read-only imported sessions. (#4183)
+
 ## [v0.51.411] — 2026-06-14 — Release NX (offline recovery verifies unreliable browser offline reports via /health probe, #4170)
 
 ### Fixed