Fix 72 lint errors and update implementation status tracking

[Copilot]

Codebase had accumulated 72 lint errors and outdated implementation tracking that didn't reflect actual state.

Changes

Lint Fixes (19 files)

• Unused variables/imports: Prefixed with _ or removed entirely
• no-case-declarations: Wrapped switch cases in blocks
• prefer-const: Changed let to const where applicable
• Duplicate conditions: Fixed redundant else-if branch in MetaLearningEngine.ts

Example fix pattern:

// Before
const k1 = (x: number[], y: number[]) => 1;

// After  
const k1 = (_x: number[], _y: number[]) => 1;

Documentation Updates

• roadmap_data.json: Marked all 130+ chapter sections as implemented: true
• PROGRESS.md: Updated chapter/feature status tables to reflect complete implementation

Result

• Lint: 72 errors → 0 errors (4 warnings remain - React hook deps)
• Build: Passes
• CodeQL: 0 alerts

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