Merge remote-tracking branch 'origin/main' into gemini-cli-resume-minimal

# Conflicts:
#	docs/cli/cli-reference.md
#	packages/cli/src/gemini.test.tsx
#	packages/cli/src/ui/AppContainer.tsx
#	packages/cli/src/ui/components/DialogManager.tsx
#	packages/cli/src/ui/components/SessionBrowser.tsx
#	packages/cli/src/ui/components/SessionSummaryDisplay.test.tsx
#	packages/cli/src/ui/components/SessionSummaryDisplay.tsx
#	packages/cli/src/ui/components/__snapshots__/SessionSummaryDisplay.test.tsx.snap
#	packages/cli/src/ui/hooks/useSessionBrowser.test.ts
#	packages/cli/src/ui/hooks/useSessionResume.test.ts
#	packages/cli/src/utils/sessionUtils.test.ts
#	packages/cli/src/utils/sessionUtils.ts
#	packages/core/src/services/chatRecordingService.ts

docs/cli/session-management.md

@@ -70,6 +70,15 @@ Browser**:
 /resume
 ```
 
+When typing `/resume` (or `/chat`) in slash completion, commands are grouped
+under titled separators:
+
+- `-- auto --` (session browser)
+  - `list` is selectable and opens the session browser
+- `-- checkpoints --` (manual tagged checkpoint commands)
+
+Unique prefixes such as `/resum` and `/cha` resolve to the same grouped menu.
+
 The Session Browser provides an interactive interface where you can perform the
 following actions:
 
@@ -82,6 +91,27 @@ following actions:
   created in a different folder, Gemini CLI confirms before continuing there.
 - **Esc:** Press **Esc** to exit the Session Browser.
 
+### Manual chat checkpoints
+
+For named branch points inside a session, use chat checkpoints:
+
+```text
+/resume save decision-point
+/resume list
+/resume resume decision-point
+```
+
+Compatibility aliases:
+
+- `/chat ...` works for the same commands.
+- `/resume checkpoints ...` also remains supported during migration.
+
+## Parallel sessions with Git worktrees
+
+When working on multiple tasks at once, you can use
+[Git worktrees](./git-worktrees.md) to give each Gemini session its own copy of
+the codebase. This prevents changes in one session from colliding with another.
+
 ## Managing sessions
 
 You can list and delete sessions to keep your history organized and manage disk
@@ -132,27 +162,36 @@ session lengths.
 
 ### Session retention
 
-To prevent your history from growing indefinitely, enable automatic cleanup
-policies in your settings.
+By default, Gemini CLI automatically cleans up old session data to prevent your
+history from growing indefinitely. When a session is deleted, Gemini CLI also
+removes all associated data, including implementation plans, task trackers, tool
+outputs, and activity logs.
+
+The default policy is to **retain sessions for 30 days**.
+
+#### Configuration
+
+You can customize these policies using the `/settings` command or by manually
+editing your `settings.json` file:
 
 ```json
 {
   "general": {
     "sessionRetention": {
       "enabled": true,
-      "maxAge": "30d", // Keep sessions for 30 days
-      "maxCount": 50 // Keep the 50 most recent sessions
+      "maxAge": "30d",
+      "maxCount": 50
     }
   }
 }
 ```
 
 - **`enabled`**: (boolean) Master switch for session cleanup. Defaults to
-  `false`.
+  `true`.
 - **`maxAge`**: (string) Duration to keep sessions (for example, "24h", "7d",
-  "4w"). Sessions older than this are deleted.
+  "4w"). Sessions older than this are deleted. Defaults to `"30d"`.
 - **`maxCount`**: (number) Maximum number of sessions to retain. The oldest
-  sessions exceeding this count are deleted.
+  sessions exceeding this count are deleted. Defaults to undefined (unlimited).
 - **`minRetention`**: (string) Minimum retention period (safety limit). Defaults
   to `"1d"`. Sessions newer than this period are never deleted by automatic
   cleanup.