usability enhancements

openspec/changes/p13-usability-enhancements/specs/footer-policy-links/spec.md

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+## MODIFIED Requirements
+
+### Requirement: Footer exposes policy navigation links
+The system SHALL display footer links for Terms of Use and Attribution on the landing page.
+
+#### Scenario: Footer links visible on landing page
+- **WHEN** a user loads the main page
+- **THEN** the footer includes links labeled "Terms of Use" and "Attribution"
+- **AND** links are visually distinguishable and keyboard focusable
+
+#### Scenario: Footer links navigate correctly
+- **WHEN** a user activates either policy link
+- **THEN** the browser navigates to the corresponding policy page
+- **AND** navigation succeeds without API dependency
+
+#### Scenario: Footer includes back-to-top action
+- **WHEN** a user reaches lower sections of the page
+- **THEN** footer exposes a "Back to Top" control
+- **AND** activating it returns viewport to page top smoothly
+
+#### Scenario: Footer includes optional GitHub and email links
+- **WHEN** GitHub repository URL and/or contact email are configured
+- **THEN** footer renders corresponding links without replacing policy links
+- **AND** absent values do not break footer layout