[STORY] v4-S24: Port template variables to new theme

[raifdmueller]

User Story

As a project maintainer, I want the new theme templates to use the same variables as v3.

Acceptance Criteria

Given the new theme templates
When all pages are rendered
Then all template variables from v3 (content, config.site_*, published_date, etc.) are available
And the new templates produce valid HTML5

Priority: Should

Epic: v4-E4 (#6)

Blocked by: v4-S20

[raifdmueller]

Analysis

All v3 template variables must be available in v4. See S18 analysis for the complete variable list. This story ensures the new theme templates use the same contract.

Key: Theme templates and SSG contract must be defined first (S20)

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