feat(optimization): implement manifest-driven extraction pipeline

- Implement `extract.ts` with robust character-aware parsing for snippets and tools.
- Consolidate research dependencies by moving `@ax-llm/ax` to root `optionalDependencies`.
- Relocate evaluation logic from `packages/core` to `scripts/optimization/lib/evals` to keep the production core lean.
- Add `optimization_targets` to `data/manifest.json` as the single source of truth for the pipeline.
- Implement comprehensive unit tests for extraction and variable masking with 100% pass rate.
- Update global config and linting rules to support the new optimization infrastructure.

scripts/validate-data.ts

@@ -6,7 +6,7 @@
 
 import * as fs from 'node:fs';
 import * as path from 'node:path';
-import type { Scenario } from '../packages/core/src/evals/schema.ts';
+import type { Scenario } from './optimization/lib/evals/schema.ts';
 
 const MANIFEST_FILE = 'data/manifest.json';
 const DEFAULT_DATA_DIR = 'data';