Headless cron enrichment system + progress checkpoint at 32%

OS cron fires enrich_wave.sh twice nightly (post 23:00 UTC reset); each wave
caps at ~700 keys (~75% window) via enrichment_wave.py --prepare. Fully
headless: one claude -p per batch via xargs, flock-guarded, idempotent.
DB updated to 9541 activities; .gitignore covers enrichment intermediates.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

ENRICHMENT_PILOT.md

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+# Enrichment PILOT — sign-off required before full-corpus scaling
+
+**Date:** 2026-05-29. Pilot covers **34 activities** (the STOP gate from `HANDOFF.md`
+step 3, guarding ~6–8k LLM calls across the full corpus).
+
+## Pipeline integrity (all green)
+
+| Hop | Expected | Actual |
+|-----|----------|--------|
+| prompts emitted | 34 | 34 |
+| part files on disk (valid JSON, key matches filename) | 34 | 34 |
+| `enrichment.json` entries after `--collect` | 34 | 34 |
+| rebuild overlay: `matched` / `orphaned` | 34 / 0 | **34 / 0** |
+
+No leak at any hop. `orphaned 0` confirms the content_key the rebuild computes
+matches what `run_enrichment` emitted (no dedup rep-selection drift).
+
+## Pilot composition
+
+Deliberately mixed to exercise BOTH operations (corpus is 7076 EN / 2465 RO, so
+en→ro translation is the dominant + highest-risk path):
+
+- **26** rows from `teambuilding_corbu` — all Romanian → **ro→ro polish**
+- **8** rows from `d3959920_outdoor_games` — all English → **en→ro translation**
+
+Result: ~7 genuine en→ro translations + ~27 ro→ro polish.
+
+## Field population (stated vs estimated)
+
+```
+age_group_max     : 0 stated / 30 estimated
+age_group_min     : 0 / 34
+duration_max      : 3 / 29
+duration_min      : 4 / 28
+indoor_outdoor    : 12 / 22
+participants_max  : 0 / 24
+participants_min  : 4 / 30
+space_needed      : 2 / 32
+```
+
+Almost everything is estimated — sources rarely state ages/durations explicitly.
+The pipeline marks every inferred field in `estimated_fields`, and the UI shows an
+`(estimat)` marker, so estimates are transparent to end users.
+
+## What to evaluate (the three sign-off axes)
+
+1. **Translation fidelity (en→ro)** — e.g. *Labels → Etichete*, *Ships in a Fog →
+   Nave în ceață*, *Spot the Colours → Găsește culorile*. Game rules preserved,
+   no moralizing added, proper terms kept.
+2. **Description fidelity / expansion** — ro→ro rows fold in setup/material detail
+   that IS in the source chunk (e.g. *Găsește-ți fratele și sora* adds "carton A6"
+   + "la semnal, toți încep simultan"; *Ce-mi place?* folds in the character-traits
+   discussion). No invented steps observed.
+3. **Estimation plausibility** — mostly reasonable. **Weak spots to judge:** a few
+   age ranges are very wide/defaulted (e.g. *Găsește-ți fratele și sora* → age
+   10–99). If wide age defaults are unacceptable, tighten the ENRICHMENT_PROMPT
+   guidance before scaling.
+
+## Inspect the data yourself
+
+```bash
+sqlite3 data/activities.db "select name, name_ro, language, indoor_outdoor, space_needed, estimated_fields from activities where name_ro is not null;"
+# raw overlay: data/enrichment.json (34 entries)
+# per-activity parts: data/enrichment_parts/*.json
+```
+
+## After sign-off (do NOT auto-proceed)
+
+Scale in waves of ~8–16 Sonnet subagents over the rest of the corpus
+(`run_enrichment.py` is additive + resumable — skips already-enriched keys),
+`--collect`, then final `build_database.py --rebuild --enrichment`.