fix: make E2E test timeouts configurable and add sensitive directory test

[jeremyeder]

Summary

• Make E2E test timeouts configurable to prevent flaky failures on slower CI runners
• Add E2E test for sensitive directory blocking (critical security feature)

Changes

• Add DEFAULT_TIMEOUT environment variable (default: 90s)
• Replace all hardcoded timeout=60 with DEFAULT_TIMEOUT
• Add new TestCriticalSecurityFeatures class
• Add test_assess_blocks_sensitive_directories() E2E test

Benefits

• Prevents flaky test failures on slower CI runners
• Allows developers to adjust timeout based on environment
• Adds end-to-end test coverage for critical security feature
• Validates sensitive directory prompts work correctly

Configuration

Set AGENTREADY_TEST_TIMEOUT environment variable to override default:

export AGENTREADY_TEST_TIMEOUT=120  # For slower systems
pytest tests/e2e/

Test Plan

• All linters pass (black, isort, ruff)
• Pre-commit hooks pass
• Conventional commit format verified
• New E2E test for sensitive directories passes (requires /etc directory)

Fixes #192

🤖 Generated with Claude Code

Co-Authored-By: Claude Sonnet 4.5 noreply@anthropic.com