Summary

Fixes all failing tests and TypeScript errors across the api and shared packages. Final state: 22 pass / 0 fail and tsc --noEmit exits 0.

Root causes & fixes

• Shared types field-name mismatch — User.userName renamed to username (lowercase) to match every consumer (db, route handler, and all tests). This was the source of the username type errors and the POST /users validation failure.
• Missing import — routes/users.ts used badRequest without importing it from lib/errors; added to the import.
• Auth middleware case-sensitivity bug — the public-route allowlist compared against "post", but Hono's c.req.method is uppercase, so unauthenticated POSTs were wrongly forced through the auth check. Changed to "POST".
• Pagination stub — implemented paginate() in shared/utils/pagination.ts per the test contract (page slice, partial last page, total/totalPages rounding, out-of-range page, empty array).
• tsconfig — switched to "types": ["bun-types"] so bun:test and process/Bun globals resolve, clearing the remaining tsc errors. (bun-types was already installed — no new dependency.)

Verification

• bun test -> 22 pass, 0 fail
• npx tsc --noEmit -> 0 errors

Constraints honoured

• No test files modified
• No new dependencies added
• Only changes required by the tests

Assumptions / notes

• Canonical user field name resolved to username (lowercase) because the immutable tests use that spelling consistently.
• paginate() does not guard size <= 0. No test exercises this and page size is not user-controllable today, so it was left out per "fix only what the tests require" — flagged for future hardening.