feat: copier update v0.9.0 — extraction docs, state tracking, architecture guides

Sync template from 29ac25b → v0.9.0 (29 template commits). Due to
template's _subdirectory migration, new files were manually rendered
rather than auto-merged by copier.

New files:
- .claude/CLAUDE.md + coding_philosophy.md (agent instructions)
- extract utils.py: SQLite state tracking for extraction runs
- extract/transform READMEs: architecture & pattern documentation
- infra/supervisor: systemd service + orchestration script
- Per-layer model READMEs (raw, staging, foundation, serving)

Also fixes copier-answers.yml (adds 4 feature toggles, removes stale
payment_provider key) and scopes CLAUDE.md gitignore to root only.

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

CHANGELOG.md

@@ -7,6 +7,19 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
 ## [Unreleased]
 
 ### Added
+- Template sync: copier update from `29ac25b` → `v0.9.0` (29 template commits)
+  - `.claude/CLAUDE.md`: project-specific Claude Code instructions (skills, commands, architecture)
+  - `.claude/coding_philosophy.md`: engineering principles guide
+  - `extract/padelnomics_extract/README.md`: extraction patterns & state tracking docs
+  - `extract/padelnomics_extract/src/padelnomics_extract/utils.py`: SQLite state tracking
+    (`open_state_db`, `start_run`, `end_run`, `get_last_cursor`) + file I/O helpers
+    (`landing_path`, `content_hash`, `write_gzip_atomic`)
+  - `transform/sqlmesh_padelnomics/README.md`: 4-layer SQLMesh architecture guide
+  - Per-layer model READMEs (raw, staging, foundation, serving)
+  - `infra/supervisor/`: systemd service + supervisor script for pipeline orchestration
+- Copier answers file now includes `enable_daas`, `enable_cms`, `enable_directory`, `enable_i18n`
+  toggles (prevents accidental deletion on future copier updates)
+
 - Expanded programmatic SEO city coverage from 18 to 40 cities (+22 cities across ES, FR,
   IT, NL, AT, CH, SE, PT, BE, AE, AU, IE) — generates 80 articles (40 cities × EN + DE)
 - `scripts/refresh_from_daas.py`: syncs template_data rows from DuckDB `planner_defaults`