Fix test assertions and lint issues in workflow/API tests

[Copilot]

Several test assertions were always-true, providing no actual validation. Fixed these to perform meaningful checks.

Changes

• test_workflows.py: Fixed workflow name matching to use substring comparison instead of len(file_words) == 1 fallback that always passed for single-word filenames
• test_workflows.py: Removed unused has_fetch_depth variable (lint fix)
• test_prompts.py: Fixed empty section detection regex to properly validate section content
• test_main.py: Fixed CORS test to verify headers exist and reject error status codes
• pyproject.toml: Downgraded requires-python from >=3.14 to >=3.13 (3.14 unreleased)

Example fix

# Before: always passes for single-word filenames
has_relation = len(overlap) > 0 or has_substring_match or len(file_words) == 1

# After: meaningful validation
has_relation = len(overlap) > 0 or has_substring_match

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