chore: initial repo setup with project brief, design specs and base docs

- BRIEF-Claude-Code.md: Claude Code start brief (13 sections)
- 2 PDF deliverables: Strategie & Contenu (84p) + Design Handoff (31p)
- README.md: project overview, local setup, structure, conventions
- MISSING-ASSETS.md: live tracker for missing media (hero video, photos, logos)
- .gitignore: excludes ThirdParty/ (commercial plugin ZIPs), PDF text extracts, WP runtime

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.gitignore

@@ -0,0 +1,74 @@
+# =============================================================================
+# Asterion VR — Refonte 2026 — .gitignore
+# =============================================================================
+
+# --- OS ---
+.DS_Store
+Thumbs.db
+desktop.ini
+ehthumbs.db
+
+# --- Editors / IDE ---
+.vscode/
+.idea/
+*.swp
+*.swo
+*~
+.history/
+
+# --- Claude Code local config (per-developer) ---
+.claude/settings.local.json
+
+# --- Environment / secrets ---
+.env
+.env.local
+.env.*.local
+*.pem
+*.key
+
+# --- WordPress sensitive files ---
+wp-config.php
+wp-config-local.php
+*.sql
+*.sql.gz
+debug.log
+error_log
+
+# --- Build artifacts / dependencies ---
+node_modules/
+vendor/
+*.log
+dist/
+build/
+.cache/
+
+# --- Backups ---
+*.bak
+*.backup
+*.orig
+
+# --- Third-party plugin ZIPs ---
+# Bricks Builder + WPML are commercial licensed plugins — each developer
+# must deposit their own purchased ZIPs in ThirdParty/ after cloning.
+# See README.md for instructions.
+/ThirdParty/
+
+# --- PDF text extracts ---
+# Auto-regenerated from the source PDFs via `pdftotext -layout`.
+/design-handoff.txt
+/strategie-et-contenu.txt
+
+# --- WordPress runtime (not part of the child theme) ---
+# The repo only contains the child theme `wp-content/themes/asterion-bricks/`.
+# Anything else under wp-content/ is LocalWP runtime, not versioned.
+/wp-content/uploads/
+/wp-content/cache/
+/wp-content/upgrade/
+/wp-content/plugins/
+/wp-content/index.php
+/wp-content/themes/twenty*/
+/wp-content/themes/index.php
+/wp-content/themes/bricks/
+
+# --- macOS resource forks (occasional Windows leak) ---
+._*