Fix the Python list_sessions docstring example to use session_id

[examon]

Fixes #2098

What was wrong

The Example: block in the CopilotClient.list_sessions docstring printed session.sessionId.
list_sessions returns list[SessionMetadata], and that dataclass declares session_id;
sessionId exists only as the wire key, mapped to session_id inside
SessionMetadata.from_dict / to_dict. There is no sessionId property, alias, or
__getattr__ fallback, so anyone copying the documented example hit AttributeError.

The change

         Example:
             >>> sessions = await client.list_sessions()
             >>> for session in sessions:
-            ...     print(f"Session: {session.sessionId}")
+            ...     print(f"Session: {session.session_id}")

One token, in the docstring text of a hand-written binding source file. No public API, behavior,
schema, or wire format change; no generated file is touched.

Why session_id is the right spelling

• SessionMetadata declares session_id and never sessionId.
• The end-to-end tests assert session_id on exactly this return value
  (python/e2e/test_session_e2e.py).
• The generated sibling type SessionMetadataSnapshot also uses session_id, and the Python
  code generator converts every property to snake_case.
• The sibling docstring for get_session_metadata already documents the same object correctly,
  as metadata.start_time.

The alternatives -- adding a sessionId alias, or renaming the dataclass field -- would both
change the public Python API, so correcting the example is the minimal correct fix.

Reproduction

Against the published package, with no server, model, or credentials:

pip install github-copilot-sdk

from copilot.client import SessionMetadata

wire = {
    "sessionId": "abc-123",
    "startTime": "2026-06-27T10:00:00Z",
    "modifiedTime": "2026-06-27T10:05:00Z",
    "isRemote": False,
    "summary": "demo session",
}
session = SessionMetadata.from_dict(wire)

# The documented example:
print(f"Session: {session.sessionId}")

Before:

Traceback (most recent call last):
  File "repro.py", line 13, in <module>
    print(f"Session: {session.sessionId}")
                      ^^^^^^^^^^^^^^^^^
AttributeError: 'SessionMetadata' object has no attribute 'sessionId'. Did you mean: 'session_id'?

After: the documented example prints Session: abc-123.

I also checked the shipped docstring itself, by parsing the example out of the installed
package's CopilotClient.list_sessions.__doc__ and executing it: it raises AttributeError
before the change and prints the session id after.

Checks run

From python/, matching .github/workflows/python-sdk-tests.yml:

• ruff check . -- passes.
• ty check copilot -- passes (2 pre-existing warnings, neither near this line).
• ruff format --check copilot/client.py -- already formatted; the changed line is 59 characters
  against a 100-character limit, so docstring-code-format has nothing to reflow.
• pytest -- per-test results are identical before and after the change, and
  test_should_list_sessions passes. The few end-to-end tests that fail in my local environment
  fail the same way on an unmodified tree.

Scope

Python only. Go already documents this method as session.SessionID (go/client.go) and .NET as
session.SessionId (dotnet/src/Client.cs), so the other bindings are correct as they stand and
no cross-binding change is needed.

[Copilot]

Pull request overview

Corrects the Python list_sessions docstring to use the actual SessionMetadata attribute.

Changes:

• Replaces sessionId with session_id in the example.

Show a summary per file

File	Description
python/copilot/client.py	Fixes the documented session ID access.

Review details

• Files reviewed: 1/1 changed files
• Comments generated: 0
• Review effort level: Medium

[github-actions]

SDK Consistency Review ✅

This PR makes a single-line documentation fix in python/copilot/client.py, correcting the attribute name in a docstring example from session.sessionId (incorrect camelCase) to session.session_id (correct Python snake_case).

No cross-SDK consistency issues identified. This is a Python-specific doc correction that does not affect other SDK implementations.

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