docs: update CHANGELOG and PROJECT.md for pSEO template improvements

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

CHANGELOG.md

@@ -6,7 +6,32 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
 
 ## [Unreleased]
 
+### Fixed
+- **Double language prefix in article URLs** — articles were served at
+  `/en/en/markets/italy` (double prefix) because `generate_articles()` stored
+  `url_path` with the lang prefix baked in, but the blueprint is already mounted
+  at `/<lang>`. Now `url_path` is stored without the prefix; canonical URLs,
+  breadcrumbs, sitemap, and admin links all generate correct single-prefix URLs.
+- **`/markets` removed from RESERVED_PREFIXES** — pSEO articles live under
+  `/markets/` and the explicit `/markets` route takes priority over the catch-all,
+  so the reservation was blocking article generation.
+- **`country-overview` schema_type** — changed from `[Article]` to
+  `[Article, FAQPage]` to enable FAQ rich results for existing FAQ content.
+
 ### Added
+- **Bilingual pSEO templates (DE + EN)** — all 3 article templates
+  (`city-cost-de`, `city-pricing`, `country-overview`) now generate proper
+  German prose via `{% if language == "de" %}` conditionals. German text uses
+  informal "Du/Dein", natural business German (not calque translation), and
+  localized labels/units (€/Std, Hauptzeit/Nebenzeit, etc.).
+- **Expanded English pSEO content** — all 3 templates expanded from ~400–900
+  words to ~1300–1500 words each. Added: Market Context/Landscape sections,
+  analytical commentary after scenario markers, cross-template links
+  (cost ↔ pricing ↔ country), planner links in FAQ answers, second CTA at
+  bottom of each article, 2 additional FAQ questions per template.
+- **Scenario cross-reference** — `city-pricing` template now embeds
+  `[scenario:city-cost-de-{{ city_key }}:operating]` to show operating cost
+  data from the investment analysis template.
 - **CMS admin improvement** — articles list now has HTMX filter bar (search,
   status, template, language), pagination (50/page), and stats strip
   (total/live/scheduled/draft counts). Article actions (publish/unpublish,