Adding user agent

[aayush3011]

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[Copilot]

Pull request overview

Adds a toolkit-specific Cosmos DB user-agent string (with optional caller prefix) and wires it through both sync and async Cosmos memory clients so Cosmos requests can be attributed in backend telemetry.

Changes:

• Introduces COSMOS_USER_AGENT / build_cosmos_user_agent() utilities and stores the resolved UA on the shared base client config.
• Adds a new user_agent constructor argument to CosmosMemoryClient and AsyncCosmosMemoryClient, forwarding it when creating CosmosClient.
• Adds unit tests covering user-agent construction/forwarding and bumps package version + changelog entry.

Reviewed changes

Copilot reviewed 8 out of 9 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
uv.lock	Bumps editable package version to 0.2.0b3.
pyproject.toml	Bumps project version to 0.2.0b3.
CHANGELOG.md	Documents the new user_agent constructor option and release entry.
azure/cosmos/agent_memory/_utils.py	Adds user-agent helpers/constants used to build the Cosmos UA string.
azure/cosmos/agent_memory/_base/base_client.py	Plumbs user_agent through base config and stores _cosmos_user_agent.
azure/cosmos/agent_memory/cosmos_memory_client.py	Forwards resolved user-agent into sync CosmosClient construction.
azure/cosmos/agent_memory/aio/cosmos_memory_client.py	Forwards resolved user-agent into async CosmosClient construction.
tests/unit/test_utils.py	Adds unit tests for user-agent helper behavior.
tests/unit/test_cosmos_memory_client.py	Adds unit tests asserting user_agent is passed to the Cosmos client.

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[Copilot]

Pull request overview

Copilot reviewed 8 out of 9 changed files in this pull request and generated 1 comment.