feat: migrate transform to 3-layer architecture with per-layer schemas

Remove raw/ layer — staging models now read landing JSON directly.
Rename all model schemas from padelnomics.* to staging.*/foundation.*/serving.*.
Web app queries updated to serving.planner_defaults via SERVING_DUCKDB_PATH.
Supervisor gets daily sleep interval between pipeline runs.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

CHANGELOG.md

@@ -6,6 +6,32 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
 
 ## [Unreleased]
 
+### Changed
+- **Extraction: one file per source** — replaced monolithic `execute.py` with per-source
+  modules (`overpass.py`, `eurostat.py`, `playtomic_tenants.py`, `playtomic_availability.py`);
+  each module has its own CLI entry point (`extract-overpass`, `extract-eurostat`, etc.);
+  shared boilerplate extracted to `_shared.py` with `run_extractor()` wrapper that handles
+  SQLite state tracking, logging, and session management
+- **Transform: 4-layer → 3-layer** — removed `raw/` layer; staging models now read landing
+  zone JSON files directly via `read_json()` with `@LANDING_DIR` variable; model schemas
+  renamed from `padelnomics.*` to per-layer namespaces (`staging.*`, `foundation.*`, `serving.*`)
+- **Two-DuckDB architecture** — web app now reads from `SERVING_DUCKDB_PATH` (analytics.duckdb)
+  instead of `DUCKDB_PATH` (lakehouse.duckdb); `export_serving.py` atomically swaps serving
+  tables after each transform run
+- Supervisor: added daily sleep interval between pipeline runs
+
+### Added
+- **Playtomic availability extractor** (`playtomic_availability.py`) — daily next-day booking
+  slot snapshots for occupancy rate estimation and pricing benchmarking; reads tenant IDs from
+  latest `tenants.json.gz`, queries `/v1/availability` per venue with 2s throttle, resumable
+  via cursor, bounded at 10K venues per run
+- Template sync: copier update v0.9.0 → v0.10.0 — `export_serving.py` module,
+  `@padelnomics_glob()` macro, `setup_server.sh`, supervisor export_serving step
+
+### Removed
+- `extract/.../execute.py` — replaced by per-source modules
+- `models/raw/` directory — raw layer eliminated; staging reads landing files directly
+
 ### Added
 - Template sync: copier update from `29ac25b` → `v0.9.0` (29 template commits)
   - `.claude/CLAUDE.md`: project-specific Claude Code instructions (skills, commands, architecture)