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gsxdsm f5e1b966ab FN-6943: add worktree file copy settings

Add configurable file-copy seeding for new task worktrees.

- Add the worktreeCopyFiles setting to project settings, schema validation, and dashboard settings UI.
- Copy selected files into acquired worktrees after checkout and record audit events for copied/skipped files.
- Document the new Worktrees setting and cover it with core, dashboard, and engine tests.

Files changed:
 .changeset/fn-6943-worktree-copy-files.md          |   7 +
 docs/dashboard-guide.md                            |   4 +
 docs/settings-reference.md                         |   1 +
 packages/core/src/__tests__/store-settings.test.ts |  24 ++++
 packages/core/src/settings-schema.ts               |   5 +
 packages/core/src/types.ts                         |   7 +
 .../app/__tests__/settings-sections.test.tsx       |  66 +++++++++
 .../dashboard/app/components/SettingsModal.tsx     | 146 ++++++++++++++++++++
 .../components/__tests__/SettingsModal.test.tsx    |  91 +++++++++++++
 .../settings/sections/WorktreesSection.tsx         |  51 ++++++-
 .../src/__tests__/worktree-acquisition.test.ts     |  69 +++++++++-
 .../src/__tests__/worktree-copy-files.test.ts      | 112 ++++++++++++++++
 packages/engine/src/run-audit.ts                   |   6 +
 packages/engine/src/worktree-acquisition.ts        |  32 ++++-
 packages/engine/src/worktree-copy-files.ts         | 147 +++++++++++++++++++++
 15 files changed, 765 insertions(+), 3 deletions(-)

Fusion-Task-Id: FN-6943

Fusion-Task-Lineage: fd1ded06-25f9-4496-8f50-6416446d2f29

2026-06-25 08:34:44 -07:00