Fix TypeScript type check CI failure: rootDir/tests conflict

[Copilot]

tsc --noEmit was failing because tsconfig.json included tests/**/* while rootDir was set to ./src, causing two errors:

• TS6059: test files not under rootDir
• TS5097: .ts extension imports (e.g. from "../src/index.ts") disallowed without allowImportingTsExtensions

Changes

tsconfig.json

• rootDir: "./src" → rootDir: "." — both src/ and tests/ now under root scope
• Added allowImportingTsExtensions: true — permits Bun-style .ts extension imports
• Added noEmit: true — required by allowImportingTsExtensions; actual builds use bun build, not tsc

.gitignore (new)

• Excludes node_modules/, dist/, *.tsbuildinfo, package-lock.json

Original prompt

Fix the failing GitHub Actions workflow Test & Lint
Analyze the workflow logs, identify the root cause of the failure, and implement a fix.
Check run ID: 69871714029
Job URL: https://github.com/githubnext/tsessebe/actions/runs/23954876432/job/69871714029