chore(deps): extend tsconfig from @doist/tsconfig

[frankieyan]

Summary

• Add @doist/tsconfig as a dev dependency
• Update tsconfig.json to extend from @doist/tsconfig
• Remove redundant strict: true (inherited from base config)

Test plan

• npm run check:types passes
• npm run build succeeds
• npm test passes (55 tests)

🤖 Generated with Claude Code

[doistbot-app]

The PR correctly adds the @doist/tsconfig dependency and extends it in tsconfig.json. However, there are consistent indentation inconsistencies across the modified files (package.json, package-lock.json, and tsconfig.json), which suggests the files may have been manually edited rather than updated via tooling. The package-lock.json should be regenerated to ensure integrity.

[scottlovegrove]

👍🏻