feat(hooks): use auto flag for session resumption after compaction

- executor.ts: Added `auto: true` to summarize body, removed subsequent prompt_async call
- preemptive-compaction/index.ts: Added `auto: true` to summarize body, removed subsequent promptAsync call
- executor.test.ts: Updated test expectation to include `auto: true`

Instead of sending 'Continue' prompt after compaction, use SessionCompaction's `auto: true` feature which auto-resumes the session.

🤖 GENERATED WITH ASSISTANCE OF [OhMyOpenCode](https://github.com/code-yeongyu/oh-my-opencode)

src/hooks/anthropic-context-window-limit-recovery/executor.test.ts

@@ -257,7 +257,7 @@ describe("executeCompact lock management", () => {
     expect(mockClient.session.summarize).toHaveBeenCalledWith(
       expect.objectContaining({
         path: { id: sessionID },
-        body: { providerID: "anthropic", modelID: "claude-opus-4-5" },
+        body: { providerID: "anthropic", modelID: "claude-opus-4-5", auto: true },
       }),
     )
 

src/hooks/anthropic-context-window-limit-recovery/executor.ts

@@ -409,7 +409,7 @@ export async function executeCompact(
             try {
               await (client as Client).session.prompt_async({
                 path: { id: sessionID },
-                body: { parts: [{ type: "text", text: "Continue" }] },
+                body: { auto: true } as never,
                 query: { directory },
               });
             } catch {}
@@ -497,21 +497,12 @@ export async function executeCompact(
             })
             .catch(() => {});
 
+          const summarizeBody = { providerID, modelID, auto: true }
           await (client as Client).session.summarize({
             path: { id: sessionID },
-            body: { providerID, modelID },
+            body: summarizeBody as never,
             query: { directory },
           });
-
-          setTimeout(async () => {
-            try {
-              await (client as Client).session.prompt_async({
-                path: { id: sessionID },
-                body: { parts: [{ type: "text", text: "Continue" }] },
-                query: { directory },
-              });
-            } catch {}
-          }, 500);
           return;
         } catch {
           const delay =

src/hooks/preemptive-compaction/index.ts

@@ -169,9 +169,10 @@ export function createPreemptiveCompactionHook(
         })
       }
 
+      const summarizeBody = { providerID, modelID, auto: true }
       await ctx.client.session.summarize({
         path: { id: sessionID },
-        body: { providerID, modelID },
+        body: summarizeBody as never,
         query: { directory: ctx.directory },
       })
 
@@ -187,22 +188,6 @@ export function createPreemptiveCompactionHook(
         .catch(() => {})
 
       state.compactionInProgress.delete(sessionID)
-
-      setTimeout(async () => {
-        try {
-          const messageDir = getMessageDir(sessionID)
-          const storedMessage = messageDir ? findNearestMessageWithFields(messageDir) : null
-
-          await ctx.client.session.promptAsync({
-            path: { id: sessionID },
-            body: {
-              agent: storedMessage?.agent,
-              parts: [{ type: "text", text: "Continue" }],
-            },
-            query: { directory: ctx.directory },
-          })
-        } catch {}
-      }, 500)
       return
     } catch (err) {
       log("[preemptive-compaction] compaction failed", { sessionID, error: err })