fix(dead-export-finder): replace JSON.parse with Schema.parseJson

[ryanbas21]

Summary

• Replaces raw JSON.parse calls with Schema.parseJson(Schema.Record(...)) in workspace-detector.ts
• Resolves TS44 preferSchemaOverJson diagnostic from the Effect Language Service
• Both call sites preserve their original error handling: lenient (returns null) in readPackageInfo, strict (raises WorkspaceNotFoundError) in detect

Test plan

• tsc --noEmit passes with no errors
• All 42 tests pass (pnpm test)
• Pre-commit hooks (eslint, prettier, syncpack) pass

🤖 Generated with Claude Code

[pullfrog]

No new issues found.

TL;DR — Mechanical refactor replacing JSON.parse with Schema.parseJson in workspace-detector.ts, resolving the Effect Language Service preferSchemaOverJson diagnostic. Error handling semantics are preserved at both call sites.

Key changes

• Add JsonRecord schema for structured JSON parsing — Module-level Schema.parseJson(Schema.Record(...)) replaces ad-hoc JSON.parse + type cast
• Port readPackageInfo to schema-based parsing — Effect.flatMap with Schema.decodeUnknown replaces the try/catch block; the outer Effect.catchAll preserves the lenient null-return behavior
• Port detect to schema-based parsing — Schema.decodeUnknown + Effect.mapError replaces Effect.try, preserving the strict WorkspaceNotFoundError on parse failure

_{Summary ｜ 1 file ｜ 1 commit ｜ base: main ← fix/prefer-schema-over-json-parse}

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