fix: harden and de-slop the merged contribution batch

Follow-ups promised on merge, plus review findings on the batch itself:

- chat: task-tool output now respects the 512KiB render cap; quick-open
  icon is visible at rest on coarse pointers and reachable by keyboard
  (row keydown no longer swallows inner-button Enter/Space); composer
  inline-code decoration drops the metric-shifting padding; a btw fork
  send carries only the boundary instruction, never the promotion notice
- sync: cascade revert/unrevert aborts busy descendants, busy state is
  read from every child store at the moment of use; rule 9 documents
  redo clearing all descendant revert markers
- electron: renderer recovery keeps memory-eviction (a valid
  render-process-gone reason) and both windows share one
  attachRendererRecovery helper
- vscode: process registry is a thin re-export of the web module
  (provider-env-aliases precedent) with ordered register/unregister
  writes and an awaited close
- server/cli: managed-process registry takes injectable deps (fixes the
  unreaped-orphans ReferenceError), corrupt settings errors name the
  file, getWorktrees test restores console.warn
- tests: module-mock harnesses removed (AgentsSidebar, SettingsView
  mobile focus — behaviors stay live but uncovered, accepted trade),
  QuestionMarkdown asserts rendered DOM
- i18n: German gains the debug-panel request keys, Japanese/German drop
  removed worktree keys, Ukrainian unit spacing fixed
- changelog: Copilot AI Credits entries (main + VS Code)

packages/ui/src/lib/i18n/messages/uk.ts

@@ -3022,7 +3022,7 @@ export const dict: Record<I18nKey, string> = {
   "memoryDebugPanel.requests.now": "зараз",
   "memoryDebugPanel.requests.noSamples": "Запитів ще немає. Тримайте цю панель відкритою, щоб фіксувати активність fetch.",
   "memoryDebugPanel.requests.chartLabel": "Запити fetch у виконанні з часом, пік {peak}",
-  "memoryDebugPanel.requests.windowHint": "останні {seconds}s",
+  "memoryDebugPanel.requests.windowHint": "останні {seconds} с",
   "memoryDebugPanel.requests.percentileChartLabel": "Перцентилі віку запитів у виконанні (p50, p90, p99, max) з часом",
   "memoryDebugPanel.common.idle": "очікування",
   "memoryDebugPanel.common.live": "live",