chore: prepare desktop 0.15.11 and agent 0.15.4

Document unified execution, coordinated Agent upgrade, workspace imports, review history and story colors. Record schema 60 and settings 22 backup boundaries and separate development evidence from release validation.

FEATURES.md

@@ -344,7 +344,7 @@ records are listed separately and do not introduce another feature status.
   failure, Agent `SIGKILL`/restart, and recovery from a reopened Desktop SQLite
   database. Successful tool START/END events appear exactly once, with no
   Prompt, provider, or tool replay observed. The current Agent source lock is
-  `0.15.3`, paired with the current Desktop release candidate `0.15.10`; formal
+  `0.15.4`, paired with the current Desktop release candidate `0.15.11`; formal
   publication status follows the separate Agent and Desktop
   release channels. Previous macOS validation covered native package installation,
   detached lifecycle, Attach, real Ask/Execute, and cancellation of tools in
@@ -982,9 +982,25 @@ records are listed separately and do not introduce another feature status.
 
 ### Open source, builds, and releases
 
-- The current Desktop candidate is `0.15.10`; published Agent `0.15.3` requires Desktop `0.15.9`, with
+- The current Desktop candidate is `0.15.11`; Agent candidate `0.15.4` requires Desktop `0.15.11`, with
   OpenCode pinned to `1.18.29` and Continue to `1.5.47`. Publication status follows the independent
   Desktop and Agent release channels.
+- Desktop `0.15.11` / Agent `0.15.4` remove Ask/Execute and general tool
+  approvals, including the former read-only boundary of old Ask conversations.
+  Schema 60 and Runtime settings 22 remove retired metadata; back up the complete
+  data directory before upgrading, and restore that backup to downgrade.
+  Remote execution requires coordinated runtime/acp 6 packages. Workspace imports,
+  file timestamps/sorting, conversation-image discovery and remote expert image
+  saves accompany removal of the Results page without deleting stored artifacts.
+  State-based timing does not reconstruct old durations; cache rates use complete
+  OpenCode input totals. Review history, responsive layouts and story-colored
+  actual event intervals retain unassigned events and neutral gaps. Summary reads
+  and review initialization reduce bounded I/O without universal performance claims.
+  Development evidence includes 25 real text requests for unified execution and
+  expert image saves, not new release-preparation requests or image generation.
+  Exact-candidate CI, signed packages, public verification and cross-version
+  active-operation recovery are separate from those checks. See the
+  [preparation record](./docs/development/release-preparation-0.15.11.md).
 - Desktop `0.15.10` unifies project/conversation navigation with ten recent
   conversations, adds independent Supervisor model selection and a default-on
   per-conversation Story Graph switch. Indexed activity paging and complete