[ketpatil77]

Fixes #121.

Add hdwallet/py.typed and include it in the manifest. Source-to-wheel validation also exposed missing setup inputs: setup.py reads requirements/cli.txt, requirements/docs.txt and requirements/tests.txt, but the archive omits them. Include those three files so the source archive can actually rebuild a wheel.

Validation on Windows / Python 3.11.9:

• Original source and wheel artifacts lack hdwallet/py.typed. Verified the corrected sdist, direct wheel, and wheel rebuilt from the extracted sdist all retain the empty marker at the correct package path. In separate installed-wheel environments outside the checkout, mypy 2.4.0 reports import-untyped before the fix; the valid consumer probe passes after the fix and a deliberately invalid consumer is rejected. These focused probes use follow_imports=silent and suppress missing dependency imports; they do not assert that the entire library is strict-type-check clean.
• Both direct and source-rebuilt wheels retain the marker. The original round-trip failed with FileNotFoundError for requirements/cli.txt; the corrected source archive rebuilds successfully. Focused installed-consumer typing probes pass. Cryptographic runtime tests, full dependency matrix, lint, and whole-library type checks were not run.
• git diff --cached --check passes.

Runtime implementations and test expectations are unchanged.