docs(terminal): name the flag the code actually sets

The suite header cited `synthesizeTerminalTitle: false`; the profiles set
`synthesizeWorkingTitle: false`. The distinction is the whole reason the
narrower flag was chosen — terminal-state frames still carry the pane's
agent identity downstream — so the wrong name buried the rationale.

Co-authored-by: Seongho.Bak <49228032+psh4607@users.noreply.github.com>

src/shared/omp-pi-semantic-title-preservation.test.ts

@@ -14,9 +14,10 @@
  *   "Pi"  — `normalizeTerminalTitle` collapsing our own extension's output to a hardcoded
  *           literal, discarding the session name and cwd along with it (#16093).
  *
- * The fix removes both: the agent owns its OSC title (`synthesizeTerminalTitle: false`,
- * the OpenCode precedent), and the normalizer canonicalizes only the rotating braille frame
- * so consecutive frames dedupe while the label survives.
+ * The fix removes both: the agent owns the title it animates (`synthesizeWorkingTitle: false`
+ * — not the stronger `synthesizeTerminalTitle: false`, because terminal-state frames still
+ * carry the pane's agent identity downstream), and the normalizer canonicalizes only the
+ * rotating braille frame so consecutive frames dedupe while the label survives.
  */
 import { describe, expect, it } from 'vitest'
 import { detectAgentStatusFromTitle, normalizeTerminalTitle } from './agent-title-status'