Release v0.51.328 — Release KR (#3800 full compaction summaries + #3061 pending-intent RFC) (#3839)

#3835 (#3800): preserve full compaction summaries. #3061: pending-intent RFC (docs). Full suite 8273, Codex SAFE, Opus SHIP, CI 11/11. #3837 dropped (red CI). Co-authored-by: rodboev <rodboev@users.noreply.github.com> Co-authored-by: franksong2702 <franksong2702@users.noreply.github.com>

docs/rfcs/README.md

@@ -54,3 +54,7 @@ First-time contributor RFCs should be discussed in an issue before opening a PR.
   and compression-lineage session IDs to one canonical visible chat target.
 - [`turn-journal.md`](turn-journal.md) — Crash-safe WebUI turn journal for
   recovering interrupted chat submissions.
+- [`webui-pending-intent-controls.md`](webui-pending-intent-controls.md) —
+  #3058 control-surface companion to #3400 for Queue, Steer, Stop-and-send,
+  Interrupt, and leftover-steer inputs submitted while a long-running agent
+  session is active.