refactor: package code organization wave 14 (#2391)
## Summary
Wave 14 of package code organization (stacks on #2367 / wave 13).
### Peels
| New module | Parent |
|---|---|
| `types/task-review.ts` | task review + PR review surface types |
| `types/documents-artifacts.ts` | documents, artifacts, review-artifact
helpers, goal citations |
| `task-store/workflow-task-create-ops.ts` | rename of `remaining-ops-4`
|
| `task-store/task-mutation-ops.ts` | rename of `remaining-ops-2` |
Public paths stay stable via `types.ts` / `store.ts` re-exports.
### LOC
- `types.ts` ~6264 → ~5871
### Shims
- `types.ts` → peels above (delete-when: consumers import domain
modules)
- `remaining-ops-4` → `workflow-task-create-ops` (rename complete)
- `remaining-ops-2` → `task-mutation-ops` (rename complete)
Only `remaining-ops-1.ts` remains of the numbered ops series.
## Test plan
- [x] `@fusion/core` typecheck
- [x] `review-artifacts` unit tests
- [x] `pnpm check:line-count` (baseline updated)
- [ ] CI merge gate
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
- **Refactor**
- Split task review, document, artifact, and goal-citation type
definitions into dedicated shared modules.
- Updated task-operation wiring to use the newer task-create/mutation
operation surfaces (no API changes intended).
- **Documentation**
- Corrected inline references and refreshed module headers to match the
current task-operation structure and domain naming.
- **Tests**
- Updated a test import to point to the current duplicate-auto-archive
backend implementation source.
- **Chores**
- Refreshed line-count baseline values to reflect the latest code
layout.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
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