build: expand typecheck coverage beyond src

backlog/tasks/task-90 - Expand-TypeScript-typecheck-coverage-beyond-src.md

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+---
+id: TASK-90
+title: Expand TypeScript typecheck coverage beyond src
+status: Done
+assignee: []
+created_date: '2026-03-06 08:18'
+updated_date: '2026-03-06 08:23'
+labels:
+  - tooling
+  - typescript
+dependencies: []
+references:
+  - /home/sudacode/projects/japanese/SubMiner/tsconfig.json
+  - /home/sudacode/projects/japanese/SubMiner/package.json
+  - /home/sudacode/projects/japanese/SubMiner/launcher
+  - /home/sudacode/projects/japanese/SubMiner/scripts
+priority: medium
+---
+
+## Description
+
+<!-- SECTION:DESCRIPTION:BEGIN -->
+Bring all repository TypeScript entrypoints outside src/ into the enforced typecheck gate so CI and local checks cover launcher/ and script files, then resolve any surfaced diagnostics.
+<!-- SECTION:DESCRIPTION:END -->
+
+## Acceptance Criteria
+<!-- AC:BEGIN -->
+- [x] #1 TypeScript typecheck covers repository TypeScript entrypoints outside src/ that should be maintained in this repo, including launcher/ and script files.
+- [x] #2 The enforced typecheck command used by CI and local development passes with the expanded coverage.
+- [x] #3 Any diagnostics surfaced by the expanded coverage are fixed without weakening existing strictness for src/.
+- [x] #4 Relevant documentation or command wiring is updated if the typecheck entrypoint changes.
+<!-- AC:END -->
+
+## Final Summary
+
+<!-- SECTION:FINAL_SUMMARY:BEGIN -->
+Added a dedicated repo-wide typecheck config at tsconfig.typecheck.json and wired package.json/CI to use `bun run typecheck` for launcher and scripts coverage without changing the existing src build config. Fixed the strict-null/indexing diagnostics surfaced in launcher/* and scripts/*, keeping src strictness intact. Verified with `bun run typecheck`, `bun run tsc --noEmit`, and `bun run test:launcher:src` (47 passing, plugin start gate OK).
+<!-- SECTION:FINAL_SUMMARY:END -->