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gsxdsm ec0256f7e5 FN-7444: add planning summary deepening checkpoint

Planning Mode now holds completed summaries behind a mandatory deepening prompt before finalization.

- Add shared constants and persistence for pending planning summaries.
- Insert the “Would you like to go deeper?” checkpoint with proceed, themed, and custom-topic responses.
- Update modal handling, API formatting, docs, changeset, and regression coverage for persisted and streamed planning flows.

Files changed:
 .changeset/fn-7444-planning-deepening-checkpoint.md       |   7 +
 docs/dashboard-guide.md                            |   4 +
 packages/core/src/index.ts                         |   2 +-
 packages/core/src/types.ts                         |  12 +
 packages/dashboard/app/components/PlanningModeModal.tsx |  25 ++-
 packages/dashboard/app/components/__tests__/PlanningModeModal.planning-flow.test.tsx       | 193 +++++++++++++++-
 packages/dashboard/src/__tests__/planning-interview-formatters.test.ts          |  79 ++++++-
 packages/dashboard/src/__tests__/routes-planning.test.ts          | 207 ++++++++++++++++-
 packages/dashboard/src/__tests__/session-persistence-roundtrip.test.ts          |  74 +++++-
 packages/dashboard/src/ai-session-store.ts         |   2 +
 packages/dashboard/src/planning.ts                 | 249 ++++++++++++++++++---
 packages/dashboard/src/test/mockCoreEngine.ts      |   2 +
 12 files changed, 815 insertions(+), 41 deletions(-)

Fusion-Task-Id: FN-7444
Fusion-Task-Lineage: 43ee1853-558b-4168-b52c-ebcc4ece4521
Co-authored-by: Fusion (runfusion.ai) <noreply@runfusion.ai>

2026-07-02 13:38:02 -07:00