bulk commit changes!

openspec/changes/archive/2026-02-13-p06-theming/specs/theme-default-system/spec.md

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+## ADDED Requirements
+
+### Requirement: System theme is default when no preference exists
+The system SHALL default to system theme behavior if no persisted theme preference is found.
+
+#### Scenario: No saved preference on first visit
+- **WHEN** a user visits the site with no stored theme value
+- **THEN** the UI resolves theme from system color-scheme preference
+- **AND** switcher indicates system mode as active
+
+#### Scenario: Persisted preference overrides system default
+- **WHEN** a user has an existing stored theme preference
+- **THEN** stored preference is applied instead of system mode
+- **AND** user-selected theme remains stable across reloads

openspec/changes/archive/2026-02-13-p06-theming/specs/theme-preference-persistence/spec.md

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+## ADDED Requirements
+
+### Requirement: Theme choice persists across sessions
+The system SHALL persist user-selected theme with localStorage as primary storage and cookie fallback when localStorage is unavailable.
+
+#### Scenario: Persist theme in localStorage
+- **WHEN** localStorage is available and user selects a theme
+- **THEN** selected theme is saved in localStorage
+- **AND** stored value is used on next visit in same browser
+
+#### Scenario: Cookie fallback persistence
+- **WHEN** localStorage is unavailable or blocked
+- **THEN** selected theme is saved in cookie storage
+- **AND** cookie value is used to restore theme on return visit

openspec/changes/archive/2026-02-13-p06-theming/specs/theme-switcher-control/spec.md

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+## ADDED Requirements
+
+### Requirement: Header provides icon-based theme switcher
+The system SHALL display a theme switcher in the top-right header area with icon controls for system, light, dark, and high-contrast modes.
+
+#### Scenario: Theme options visible as icons
+- **WHEN** a user views the header
+- **THEN** all four theme options are represented by distinct icons
+- **AND** each option is keyboard-accessible and screen-reader labeled
+
+#### Scenario: Theme selection applies immediately
+- **WHEN** a user selects a theme option
+- **THEN** the page updates visual theme without full page reload
+- **AND** selected option has a visible active state