v10.1.4

fix(packaging): exclude scripts/ tests/ docs/ from sdist

scripts/release.sh's pre-publish leak check correctly blocked
v10.1.4 publish because the sdist still contained scripts/. Adds the
three CLAUDE.md-mandated dev-only directories (scripts, tests, docs)
to [tool.hatch.build.targets.sdist] exclude.

Verified: rebuilt sdist no longer contains /scripts/, /tests/, /docs/.
release.sh leak check now passes.