usability enhancements

openspec/changes/p13-usability-enhancements/specs/error-pages-with-playful-ai-messaging/spec.md

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+## ADDED Requirements
+
+### Requirement: Error pages prominently display status code
+The system SHALL show prominent HTTP status code display on 404 and 500 pages.
+
+#### Scenario: 404 rendering
+- **WHEN** user visits a non-existent route
+- **THEN** the page prominently displays `404`
+
+#### Scenario: 500 rendering
+- **WHEN** an internal server error page is rendered
+- **THEN** the page prominently displays `500`
+
+### Requirement: Error pages include safe playful AI-style messaging
+The system SHALL render an "Oh no!" style playful message that is safe and policy-compliant.
+
+#### Scenario: Safe message selection
+- **WHEN** an error page is displayed
+- **THEN** a playful message is selected from a curated safe message set
+- **AND** message excludes profanity and discriminatory/abusive content