Enforce maximum test execution time of 20-30 seconds

[twistedmelonman]

Problem:
Tests are taking too long to execute, slowing down feedback loops for developers.

Examples:

• Tests with complex logic, multiple branches, or varied inputs
• Extended-duration tests running automatically as part of the standard suite
• Tests without clear, simple pass/fail criteria

Solutions:

1. Enforce a 20-30 second maximum per test; fail the suite if exceeded
2. Decompose complex tests into smaller, focused tests with single assertions
3. Move extended tests to a separate, opt-in suite (not part of default commit hooks)