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gsxdsm d08ec053a6 FN-6488: centralize dashboard beforeExit cleanup

Centralize dashboard cleanup registration to prevent repeated module imports from accumulating beforeExit listeners.

- Add a Symbol.for-backed dashboard process lifecycle registry with one shared beforeExit listener.
- Register existing cleanup intervals through the shared lifecycle helper across dashboard modules.
- Cover repeated module evaluation and multi-cleanup dispatch with Vitest regression tests.

Files changed:
 .../src/__tests__/process-lifecycle.test.ts        | 76 ++++++++++++++++++++++
 packages/dashboard/src/agent-generation.ts         |  3 +-
 packages/dashboard/src/ai-refine.ts                |  3 +-
 .../dashboard/src/milestone-slice-interview.ts     |  3 +-
 packages/dashboard/src/mission-interview.ts        |  3 +-
 packages/dashboard/src/planning.ts                 |  3 +-
 packages/dashboard/src/process-lifecycle.ts        | 63 ++++++++++++++++++
 packages/dashboard/src/server.ts                   |  3 +-
 packages/dashboard/src/subtask-breakdown.ts        |  3 +-
 9 files changed, 153 insertions(+), 7 deletions(-)

Fusion-Task-Id: FN-6488
Fusion-Task-Lineage: 3ec47f17-ae38-4ee3-a3fa-3132d23a2b12

2026-06-16 15:08:24 -07:00