Import Bubble export trees into PageOps and finish CSOC-WP-0001

Add import_content_tree management command and import_tree helper for
ADR-0004 sample trees. Document reichelag rehearsal lossiness; mark T02/T04
and the bubble exit workplan finished.

docs/migration/export-progress-2026-08-13.md

@@ -72,8 +72,10 @@ parent: ""           # context_custom_article when set
 ## Next
 
 1. Optional: longer crawl / pagination to fill more per-space articles.  
-2. **T04 rehearsal:** PageOps import of local tree into app content dir (CSOC-WP-0006).  
-3. Member → NetKingdom identity mapping for membership lists (no passwords).
+2. ~~**T04 rehearsal:** PageOps import~~ → done 2026-08-13  
+   (`docs/migration/rehearsal-reichelag-2026-08-13.md`, `import_content_tree`).  
+3. Member → NetKingdom identity mapping for membership lists (no passwords).  
+4. Multi-space import over full corpus (residual after single-space rehearsal).
 
 ## Related
 

docs/migration/rehearsal-reichelag-2026-08-13.md

@@ -0,0 +1,78 @@
+# Migration rehearsal — reichelag sample (2026-08-13)
+
+| Field | Value |
+|-------|--------|
+| Workplan | CSOC-WP-0001-T04 |
+| Depends on | CSOC-WP-0006 PageOps landing pad |
+| Source (local only) | `~/.config/coulomb-social/auth/exports/corpus-202608131015057/trees/reichelag/` |
+| Destination | `CONTENT_ROOT/spaces/reichelag/` (local; not committed) |
+| Command | `manage.py import_content_tree` |
+
+**Do not commit** source trees or imported content — private business notes.
+
+## Command
+
+```bash
+export CONTENT_ROOT="$PWD/var/content-rehearsal"   # or default var/content
+uv run python manage.py migrate
+# sign-in once or ensure a Member exists for --member-subject
+uv run python manage.py import_content_tree \
+  ~/.config/coulomb-social/auth/exports/corpus-202608131015057/trees/reichelag \
+  --tenant tenant:coulomb \
+  --member-subject <your-oidc-subject> \
+  --replace
+```
+
+Dry-run:
+
+```bash
+uv run python manage.py import_content_tree PATH/TO/tree --dry-run
+```
+
+## Result (this run)
+
+| Metric | Value |
+|--------|------:|
+| Pages copied | 30 (1 index + 29 articles) |
+| Assets copied | 29 (logo/visual images) |
+| Space row | Created `reichelag` title **ReichelAG** |
+| Render path | `load_space_page` → `source=content-plane` |
+| Index title | ReichelAG |
+| Sample page | frontmatter title + markdown body render OK |
+| Visual files | Present under `assets/` for pages that declare them |
+
+## Lossiness and residuals
+
+| Gap | Severity | Note |
+|-----|----------|------|
+| Bubble `Slug` vs export slug | low | Bubble space slug was `new-space-36`; export/tree uses friendly `reichelag` |
+| Space display title | medium | Not first-class on `custom.space`; taken from index frontmatter / guess |
+| Membership list | medium | Only local owner from `--member-subject`; Bubble `members_list_user` not mapped to NetKingdom |
+| Parent/article graph | medium | Frontmatter `parent` kept as opaque bubble id; no outline/include graph yet |
+| Full corpus coverage | high | Only **one** dense sample tree; 70 other spaces not imported; many spaces have incomplete article dumps |
+| Chunk / Research UI | deferred | Bubble `pg_chunk` / Research surfaces not in tree |
+| Workflows / privacy flags | deferred | `isprivate_boolean` not enforced in rebuild authz beyond tenant membership |
+| Identity | blocked elsewhere | Member transfer assist / public registration (CSOC-IN-0001) |
+| Production path | deferred | Rehearsal is local `CONTENT_ROOT`; cluster import needs operator CONTENT_ROOT volume + tenant choice |
+
+## What worked losslessly (for this tree)
+
+- Page **Title / Abstractor / Visual** frontmatter → PageOps + Space index fields  
+- Markdown **body** → content-plane render (bleach markdown pipeline)  
+- Relative **visual** assets under `assets/`  
+- **Page list** via `list_pages`  
+- Idempotent re-import with `--replace`
+
+## Acceptance against CSOC-WP-0001
+
+- [x] At least one migration rehearsal run  
+- [x] Residual gaps listed (above)  
+- [ ] Bulk multi-space import + NK membership map — residual  
+- [ ] Apex cutover — still gated on product parity + self-registration  
+
+## Related
+
+- Export progress: `docs/migration/export-progress-2026-08-13.md`  
+- Field map: `docs/migration/field-map-from-session-2026-08-13.md`  
+- PageOps: `coulomb_social/apps/spaces/pageops.py`, `import_tree.py`  
+- Stage-1 cut: `docs/decisions/2026-08-12-feature-cut-stage-1.md`