usability enhancements

openspec/changes/p13-usability-enhancements/specs/site-branding-favicon/spec.md

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+## ADDED Requirements
+
+### Requirement: Site includes AI-themed favicon
+The system SHALL include an AI-themed favicon asset and reference it from public pages.
+
+#### Scenario: Favicon linked in document head
+- **WHEN** a public page is loaded
+- **THEN** a favicon link element resolves to the configured AI-themed icon asset
+
+#### Scenario: Favicon asset is cacheable and valid
+- **WHEN** browser requests favicon asset
+- **THEN** asset responds successfully with a valid icon format
+- **AND** can be cached using standard static-asset policy