audit: verify skills.ts against reference documents

- Python: startYear corrected 2019→2017 (self-taught during Tesco night
  shifts per secondary ref); yearsOfExperience 6→8
- SQL: startYear corrected 2018→2022 (learned after gaining NHS database
  access per secondary ref); removed unverified pre-2022 history entries
- Power BI: fixed prescribing history year inconsistency (2019→2020);
  removed "PharMetrics real-time expenditure dashboard" reference
- All skill categories and names verified against CV Core Competencies

src/data/skills.ts

@@ -23,14 +23,14 @@ export const skills: SkillMedication[] = [
     id: 'python',
     name: 'Python',
     frequency: 'Daily',
-    startYear: 2019,
-    yearsOfExperience: 6,
+    startYear: 2017,
+    yearsOfExperience: 8,
     proficiency: 90,
     category: 'Technical',
     status: 'Active',
     icon: 'Code2',
     prescribingHistory: [
-      { year: 2017, description: 'Started: Self-taught for data analysis automation' },
+      { year: 2017, description: 'Started: Self-taught during Tesco night shifts for data analysis automation' },
       { year: 2019, description: 'Increased: Dashboard development, data pipeline work' },
       { year: 2022, description: 'Specialist use: Blueteq automation, Sankey analysis tools' },
       { year: 2024, description: 'Advanced: Switching algorithm (14,000 patients), CD monitoring' },
@@ -41,16 +41,15 @@ export const skills: SkillMedication[] = [
     id: 'sql',
     name: 'SQL',
     frequency: 'Daily',
-    startYear: 2018,
-    yearsOfExperience: 7,
+    startYear: 2022,
+    yearsOfExperience: 3,
     proficiency: 88,
     category: 'Technical',
     status: 'Active',
     icon: 'Database',
     prescribingHistory: [
-      { year: 2017, description: 'Started: Basic querying for prescribing analysis' },
-      { year: 2019, description: 'Increased: Complex joins, data transformation' },
-      { year: 2022, description: 'Advanced: Patient-level analytics, dm+d integration' },
+      { year: 2022, description: 'Started: Gained access to NHS databases, prescribing data querying' },
+      { year: 2023, description: 'Increased: Complex joins, data transformation, Blueteq integration' },
       { year: 2024, description: 'Specialist: Comprehensive medicines data table development' },
       { year: 2025, description: 'Current: Population health data infrastructure' },
     ],
@@ -66,9 +65,9 @@ export const skills: SkillMedication[] = [
     status: 'Active',
     icon: 'PieChart',
     prescribingHistory: [
-      { year: 2019, description: 'Started: Dashboard creation for team reporting' },
-      { year: 2021, description: 'Increased: DAX measures, data modelling' },
-      { year: 2024, description: 'Advanced: PharMetrics real-time expenditure dashboard' },
+      { year: 2020, description: 'Started: Dashboard creation for team reporting' },
+      { year: 2022, description: 'Increased: DAX measures, data modelling' },
+      { year: 2024, description: 'Advanced: Switching progress dashboards, executive reporting' },
       { year: 2025, description: 'Current: DOAC switching scenario model, executive reporting' },
     ],
   },