feat: prepare ARR for controlled public deployment

.dockerignore

@@ -0,0 +1,39 @@
+.git
+.gitignore
+.planning
+.project-docs
+.work
+.tmp
+.validation
+.venv
+.venv-mcp
+.venv*
+**/__pycache__
+**/*.py[cod]
+**/.pytest_cache
+**/.mypy_cache
+**/.ruff_cache
+**/node_modules
+.env
+.env.*
+*.env
+!*.env.example
+!**/*.env.example
+!deploy/.env.production.example
+*.log
+*.sqlite3
+*.sqlite3-*
+outputs
+runtime
+private-fixtures
+task_plan.md
+findings.md
+progress.md
+tests
+*.xml
+*.XML
+*.xlsx
+!arr-opera-daily-ingest/assets/*.xlsx
+!arr-opera-daily-ingest/references/*.xlsx
+!opera-daily-channel-report/assets/*.xlsx
+!opera-daily-channel-report/references/*.xlsx