docs: establish approved Phase 1 design + Phase 2 spec as project foundation

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

.gitignore

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+# Dependencies
+node_modules/
+.pnpm-store/
+
+# Build output
+site/dist/
+site/.astro/
+**/bin/
+**/obj/
+
+# Test artifacts
+tests/test-results/
+tests/playwright-report/
+tests/.cache/
+coverage/
+
+# Env & secrets
+.env
+.env.*
+!.env.example
+*.pfx
+relay/appsettings.*.local.json
+
+# OS / editor
+.DS_Store
+Thumbs.db
+.vscode/
+.idea/
+
+# Mission prompt scratch files (kept locally, not part of the product)
+step1.txt
+step2.txt
+step3.txt
+
+# Logs
+*.log
+npm-debug.log*