Move the test-auth0 and test-slack verification scripts out of src/

[RUKAYAT-CODER]

Overview

src/test-auth0.ts and src/test-slack.ts are manual verification scripts — test-auth0.ts prints a banner, instantiates JwtStrategy, and logs a mock payload through roughly twenty console.log calls. They live inside src/, so they are compiled into the production bundle by tsconfig.build.json, scanned by ESLint's src/**/*.ts glob, and counted in coverage. They also import from src/auth/, which means a refactor of the auth module has to keep a throwaway script compiling. Their filenames begin with test- but they are not Jest tests and are not picked up by any test configuration, so they satisfy neither purpose cleanly.

Specifications

Features:

• Manual verification scripts live under scripts/ and are excluded from the production build.
• The src/ tree contains only application code.

Tasks:

• Move both files to scripts/verify-auth0.ts and scripts/verify-slack.ts.
• Exclude scripts/ from tsconfig.build.json.
• Add npm scripts documenting how to run each verification.
• Convert the assertions into real Jest tests if the behaviour they check is worth guarding, and delete the scripts if it is not.
• Confirm the production bundle no longer contains them.

Impacted Files:

• src/test-auth0.ts
• src/test-slack.ts
• tsconfig.build.json
• package.json

Acceptance Criteria

• Neither file remains under src/.
• The compiled dist/ output contains no verification script.
• Each script is runnable through a documented npm script.
• Coverage figures no longer include these files.