MLE-22708 - Adds vector encoding/decoding utilities

[BillFarber]

Implements utilities for encoding and decoding vectors to/from base64 strings, mirroring MarkLogic's vec:base64-encode and vec:base64-decode functions.

• Enables interoperability between Python and MarkLogic for vector data.
• Includes tests to verify encoding and decoding functionality in Python and against a MarkLogic server.

80% Copilot generated. I just had to fix the tests that send requests to MarkLogic.

[Copilot]

Pull Request Overview

Implements Python utilities to encode/decode float vectors as base64 strings compatible with MarkLogic’s vec:base64 functions, adds corresponding unit and integration tests, and updates the test environment Docker Compose configuration.

• Introduces VectorUtil with base64_encode/base64_decode methods in marklogic/vector_util.py
• Adds Python and server-backed tests in tests/test_vector_util.py
• Updates test-app/docker-compose.yml to rename the test service and use the MarkLogic 12 image

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
tests/test_vector_util.py	New tests for encoding/decoding vectors in Python and via server
test-app/docker-compose.yml	Renamed test service and updated MarkLogic image reference
marklogic/vector_util.py	Added base64 encoding/decoding utility for float vectors

Comments suppressed due to low confidence (2)

tests/test_vector_util.py:24

• Consider adding a test case that passes a base64 string with a non-zero version header to base64_decode and asserts that a ValueError is raised, to cover the unsupported version path.

    for a, b in zip(decoded, VECTOR):

test-app/docker-compose.yml:1

• [nitpick] The commented-out original service name is no longer needed—removing it will reduce confusion and clean up the configuration.

# name: docker-tests-marklogic_python

[rjrudin]

Looks good, just a couple renaming things and then merge away.