Summary

Fixes #164 - Exposes the Dhatupatha code (e.g., 01.0001 for भू) in the Python API's DhatuEntry class.

Implementation

Following the exact same pattern as #163 (artha field implementation), this PR adds the code field to make dhatu codes accessible from Python.

Changes

Modified vidyut-kosha/src/entries.rs

1. Added code: Option<String> field to DhatuMeta struct
2. Added code: Option<String> field to DhatuMetaBuilder struct
3. Added code() accessor method to DhatuEntry
4. Added code() builder method to DhatuMetaBuilder
5. Updated build() method to include code field

Modified bindings-python/src/kosha/entries.rs

1. Added code: Option<String> field to PyDhatuEntry struct with documentation
2. Updated constructor to accept code parameter
3. Updated __repr__() to include code in output
4. Updated From<&DhatuEntry> implementation to map code field

Modified bindings-python/test/unit/kosha/test_entries.py

1. Added test_dhatu_entry_with_code() test function
2. Updated existing __repr__ tests to expect code=None in output

Example Usage

from vidyut.kosha import DhatuEntry
from vidyut.prakriya import Dhatu, Gana

bhu = Dhatu.mula("BU", Gana.Bhvadi)
entry = DhatuEntry(dhatu=bhu, clean_text="BU", code="01.0001", artha_sa="sattAyAm")

assert entry.code == "01.0001"  # Now accessible!