feat: update pipeline orchestrator for Kaikki — wire up stages 1 and 2

- Replace checkOmwExists with checkExtractedFilesExist
- Wire up importKaikki and reverseLink as real stage implementations
- Track reverse link completion via sentinel row in run_status
- Update report to use resolved_entry_cefr and entry counts
- Stages 3 onwards remain as stubs

documentation/data-pipeline.md

@@ -314,9 +314,12 @@ These are not part of the current pipeline but are worth considering as the data
 
 ## Roadmap
 
-**Current state:** Production schema migrated to Kaikki flat model. Stage 1 extraction scripts written and sample run complete (500 entries per language). pipeline.db initialised and imported with sample data. Stage 2 reverse link sync not yet written. llama.cpp not installed.
+**Current state:** Stage 1 extraction and stage 2 reverse link sync scripts
+written and verified on sample data. pipeline.db contains 4,156 entries and
+4,287 translations across 5 languages. Stage 3 enrich scripts not yet written.
+llama.cpp not installed.
 
-**Next action:** Write the stage 2 reverse link sync script.
+**Next action:** Write the stage 3 enrich script.
 
 | Stage           | Status         |
 | --------------- | -------------- |
@@ -339,11 +342,11 @@ These are not part of the current pipeline but are worth considering as the data
 - [ ] Remove sample limit and run full extraction
 - [ ] Re-run full import → `pipeline.db`
 
-### Stage 2 — Reverse link sync `🔲 not started`
+### Stage 2 — Reverse link sync `🔄 in progress`
 
-- [ ] Write reverse link sync script
-- [ ] Write tests
-- [ ] Run reverse link sync → `pipeline.db`
+- [x] Write reverse link sync script
+- [x] Run reverse link sync on sample data → 141 links inserted
+- [ ] Run reverse link sync on full data after full extraction
 
 ### Stage 3 — Enrich `🔲 not started`