Add response_delay_seconds to Flask mock

[adamtheturtle]

Summary

• Add response_delay_seconds setting to the Flask mock (VWSSettings and VWQSettings) for testing timeout handling
• Settings are configurable via RESPONSE_DELAY_SECONDS environment variable
• Mirrors the existing response_delay_seconds parameter in MockVWS
• Adds two tests verifying default behavior (no delay) and delay application

🤖 Generated with Claude Code

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Note

Low Risk
Default behavior is unchanged (0.0 delay) and the change is isolated to test/mock server response timing; main risk is unintended slowdown if the env var is set in CI or user environments.

Overview
Adds a new response_delay_seconds setting to the Flask-based mocks (VWSSettings and VWQSettings) and applies it via after_request hooks to sleep before returning responses, enabling simulation of slow servers via the RESPONSE_DELAY_SECONDS environment variable.

Updates tooling/config (pyproject.toml vulture decorator ignores, CHANGELOG.rst) and adds tests that assert the default behavior has no delay and that a configured delay increases request duration.

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