Add authoring guide, stack adapters, and CI layer distinction

- AUTHORING.md: instructions for teams writing requirements + tests
- Stack adapters: java.patterns, python.patterns, go.patterns
- Quality checklist for new requirements
- Open question on adapter threshold for minor stacks

.tests/adapters/go.patterns

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+cloud_sdk_imports=cloud\.google\.com/go|aws-sdk-go|azure-sdk-for-go
+jwt_libraries=golang-jwt|dgrijalva/jwt
+auth_endpoints=HandleFunc.*"/login"|Handle.*"/authenticate"
+external_url=https?://(?!localhost|127\.0\.0\.1|10\.|192\.168\.)(?!.*reltio\.(com|net|io))

.tests/adapters/java.patterns

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+cloud_sdk_imports=com\.amazonaws\.|com\.google\.cloud\.|com\.azure\.
+jwt_libraries=io\.jsonwebtoken|com\.auth0\.jwt
+auth_endpoints=@PostMapping.*"/login"|@RequestMapping.*"/authenticate"
+external_url=https?://(?!localhost|127\.0\.0\.1|10\.|192\.168\.)(?!.*reltio\.(com|net|io))

.tests/adapters/python.patterns

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+cloud_sdk_imports=import boto3|from google\.cloud|from azure\.
+jwt_libraries=import jwt|from jose|from authlib
+auth_endpoints=@app\.route.*/login|@app\.post.*/authenticate|def login\(
+external_url=https?://(?!localhost|127\.0\.0\.1|10\.|192\.168\.)(?!.*reltio\.(com|net|io))