SEO/E-E-A-T: fix author attribution across all blog articles

- Remap 20 articles from generic team names (UK Data Services Legal Team,
  Analytics Team, Technical Team etc.) to matching named authors from the
  author database (Sarah Chen, David Martinez, Michael Thompson, etc.)
- Add 5 new named authors to author-bio.php: Alex Kumar, David Thompson,
  Emily Roberts, Michael Chen, Sarah Mitchell
- Eliminates author name/bio mismatch where team name showed but
  Editorial Team bio/role rendered instead

includes/author-bio.php

@@ -56,6 +56,45 @@ $authors = [
         'expertise' => ['Tableau', 'Power BI', 'Data Visualization', 'BI Strategy'],
         'image' => '/assets/images/authors/david-martinez.svg'
     ],
+    'Alex Kumar' => [
+        'role' => 'Senior Python Engineer',
+        'bio' => 'Alex is a Senior Python Engineer specialising in data pipeline architecture and workflow orchestration. He has 9 years of experience building production-grade pipelines with Airflow, Prefect and Dagster for UK data teams.',
+        'linkedin' => 'https://linkedin.com/company/ukdataservices',
+        'expertise' => ['Python', 'Airflow', 'Prefect', 'Data Pipelines'],
+        'image' => '/assets/images/authors/team-avatar.svg'
+    ],
+
+    'David Thompson' => [
+        'role' => 'Data Protection & International Compliance Lead',
+        'bio' => 'David Thompson specialises in cross-border data transfer compliance, advising UK businesses on GDPR, UK GDPR, SCCs and adequacy decisions. He has over 10 years of experience in international data law.',
+        'linkedin' => 'https://linkedin.com/company/ukdataservices',
+        'expertise' => ['GDPR', 'Data Transfers', 'SCCs', 'UK GDPR'],
+        'image' => '/assets/images/authors/team-avatar.svg'
+    ],
+
+    'Emily Roberts' => [
+        'role' => 'Data Subject Rights Specialist',
+        'bio' => 'Emily Roberts is a certified data protection practitioner with expertise in operationalising data subject rights under UK GDPR. She has helped over 40 UK organisations build compliant DSR workflows.',
+        'linkedin' => 'https://linkedin.com/company/ukdataservices',
+        'expertise' => ['GDPR', 'Data Subject Rights', 'Privacy', 'Compliance'],
+        'image' => '/assets/images/authors/team-avatar.svg'
+    ],
+
+    'Michael Chen' => [
+        'role' => 'Data Engineer & Manufacturing Analytics Specialist',
+        'bio' => 'Michael Chen is a data engineer with deep expertise in manufacturing analytics and supply chain data transformation. He has designed data systems for UK manufacturers across automotive, FMCG and industrial sectors.',
+        'linkedin' => 'https://linkedin.com/company/ukdataservices',
+        'expertise' => ['Data Engineering', 'Manufacturing Analytics', 'ETL', 'Supply Chain'],
+        'image' => '/assets/images/authors/team-avatar.svg'
+    ],
+
+    'Sarah Mitchell' => [
+        'role' => 'Fintech Data Analyst',
+        'bio' => 'Sarah Mitchell is a fintech data analyst with 7 years of experience in UK financial services market intelligence. She specialises in regulatory data analysis, open banking datasets and fintech competitive intelligence.',
+        'linkedin' => 'https://linkedin.com/company/ukdataservices',
+        'expertise' => ['Fintech', 'Market Analysis', 'Open Banking', 'Financial Data'],
+        'image' => '/assets/images/authors/team-avatar.svg'
+    ],
     'Emma Richardson' => [
         'role' => 'Industry Analyst',
         'bio' => 'Emma covers UK market trends and industry analysis with a focus on retail, property, and e-commerce sectors. She has over 6 years of experience in competitive intelligence and market research.',