_read_tsconfig_aliases joined alias targets onto the tsconfig's own
directory and ignored compilerOptions.baseUrl. In the common monorepo /
NestJS layout (baseUrl "./src" with "@services/*": ["services/*"]), the
alias resolved to <dir>/services instead of <dir>/src/services, so every
aliased import failed to resolve and the import edge was silently dropped
— leaving cross-file caller graphs nearly empty on alias-heavy TS repos.
Resolve `paths` relative to `baseUrl` (TypeScript's actual semantics),
defaulting to "." so configs without baseUrl keep their current behavior.
Add a regression test covering a subdirectory baseUrl; the existing alias
test only exercised baseUrl ".", which is why this slipped through.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
