fix: prettier formatting in shell/instance.ts to unblock CI

[Copilot]

The build_ts (windows-latest) CI job was failing due to a Prettier violation in ts/packages/shell/src/main/instance.ts.

Change

Reformatted a multi-argument getIndexingServiceRegistry call to comply with Prettier's line-length rules:

// Before
const indexingServiceRegistry =
    await getIndexingServiceRegistry(instanceDir, configName);

// After
const indexingServiceRegistry = await getIndexingServiceRegistry(
    instanceDir,
    configName,
);

Original prompt

Fix the failing GitHub Actions workflow build_ts (windows-latest, 20)
Analyze the workflow logs, identify the root cause of the failure, and implement a fix.
Job ID: 68255981694
Job URL: https://github.com/microsoft/TypeAgent/actions/runs/23459090935/job/68255981694

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