One-off, idempotent migration of gws_project data out of Space.

For each project that still has a space_folder_id, this task copies the content of its Space folders into local storage:

• Space DOCUMENT objects are downloaded and stored as FILE documents in the brick's dedicated file store.
• Space CONSTELLAB_DOCUMENT objects are converted to local rich-text NOTE documents (content fetched via the Space API).
• Task documents (identified by the Space tag task:<task_id> in the root task's folder) are attached to the exact task; documents in a task folder whose tag matches no existing task are attached to the root task and flagged as orphans in the report.
• Other object types (lab notes, scenarios, resources, ...) are skipped and listed in the report: they are lab objects synced to Space and stay accessible; only the app's aggregated view of them disappears.

The task is idempotent: every migrated document records its Space id (space_document_id), and already-migrated ids are skipped on re-run. It never writes to Space — the Space folders are left untouched as an archive. Per-document errors are reported and never abort the run.

Config:

• dry_run (default True): only report what would be migrated, without downloading or writing anything. Run once with dry_run=True, review the report (including the total byte size against the lab's disk space), then re-run with dry_run=False.

Output: a JSON report with per-project counts and details (migrated files and notes, already-migrated, orphans, skipped objects, errors, byte size).