Detach retained CI and terminal tails from oversized strings (#20960)

* fix(memory): detach retained CI and terminal tails from oversized strings

* fix(terminal): detach retained error and reattach string slices

* fix(terminal): release oversized recent-output backing strings

* fix(terminal): release backing strings held by PTY detectors

* fix(memory): own bounded Claude background task labels

* fix: detach retained terminal mode scan tails

* fix: own retained plugin worker output strings

* fix: own incomplete OSC 133 carry strings

---------

Co-authored-by: m4air <m4air@Mac.localdomain>
Co-authored-by: m4air <m4air@m4airs-MacBook-Air.local>

src/main/plugins/plugin-worker-output-buffer.ts

@@ -1,4 +1,5 @@
 import type { Readable } from 'node:stream'
+import { ownRetainedString } from '../../shared/own-retained-string'
 
 type PluginWorkerOutputSink = (level: 'info' | 'warn' | 'error', line: string) => void
 
@@ -21,9 +22,11 @@ export function pipePluginWorkerOutput(
     if (line.trim().length > 0) {
       log(
         level,
-        truncated
-          ? `${line.slice(0, PLUGIN_WORKER_OUTPUT_LINE_LIMIT - TRUNCATION_SUFFIX.length)}${TRUNCATION_SUFFIX}`
-          : line
+        ownRetainedString(
+          truncated
+            ? `${line.slice(0, PLUGIN_WORKER_OUTPUT_LINE_LIMIT - TRUNCATION_SUFFIX.length)}${TRUNCATION_SUFFIX}`
+            : line
+        )
       )
     }
   }
@@ -49,7 +52,7 @@ export function pipePluginWorkerOutput(
         buffered = ''
         discarding = newline === -1
       } else {
-        buffered += segment
+        buffered += newline === -1 ? ownRetainedString(segment) : segment
         if (newline !== -1) {
           emit(buffered)
           buffered = ''