fix: Improve usage reporting

[jsonbailey]

Requirements

• I have added test coverage for new or changed functionality
• I have followed the repository's pull request submission guidelines
• I have validated my changes against all supported platform versions

Related issues

• Implements AIC-1636
• Spec: https://github.com/launchdarkly/sdk-specs/pull/132 and https://github.com/launchdarkly/sdk-specs/pull/135
• JS reference implementation: fix: Improve usage reporting js-core#1108
• Python reference implementation: fix: Improve usage reporting python-server-sdk-ai#92

Describe the solution you've provided

Updates the .NET AI SDK's usage tracking to align with the updated spec. Key changes:

1. Renamed usage tracking event key from $ld:ai:config:function:single to $ld:ai:usage:completion-config, following the new $ld:ai:usage:* naming convention from the spec.

2. Added SDK info tracking on initialization ($ld:ai:sdk:info). When LdAiClient is constructed, it fires a tracking event with aiSdkName, aiSdkVersion, and aiSdkLanguage using an anonymous context (kind ld_ai, key ld-internal-tracking). SDK metadata lives in a new SdkInfo static class (SdkInfo.cs) for reuse across the package.

3. Renamed Config method to CompletionConfig on both ILdAiClient and LdAiClient. The old Config method is preserved but marked [Obsolete] and proxies to CompletionConfig.

4. Separated usage tracking from config evaluation. Following the pattern in the JS implementation, CompletionConfig (public) handles usage tracking and delegates to a private Evaluate method for the actual config retrieval. This prevents double-counting if higher-level entry methods (e.g. createChat) are added in the future.

5. Added SdkInfo.cs to release-please-config.json extra-files so that the SdkInfo.Version constant is automatically bumped on release (flagged by Bugbot).

6. Updated XML doc comments to use "AI Completion Config" wording consistently across ILdAiClient.cs and LdAiClient.cs (per reviewer feedback).

Note: The .NET SDK does not currently have agent, judge, createChat, or createJudge methods, so only the single completion-config usage event key needed updating.

Human review checklist

• Verify event key strings ($ld:ai:sdk:info, $ld:ai:usage:completion-config) exactly match the spec
• Verify the anonymous context (kind ld_ai, key ld-internal-tracking) matches spec requirement 1.2.2.1
• Confirm SdkInfo.Version = "0.9.1" matches the current version in LaunchDarkly.ServerSdk.Ai.csproj and that the x-release-please-version annotation in SdkInfo.cs will be picked up correctly now that it's in extra-files
• Confirm the breaking ILdAiClient interface change (adding CompletionConfig) is acceptable for a pre-release SDK
• Verify that SDK info tracking firing per LdAiClient instantiation (rather than once globally) aligns with spec intent
• Note: the deprecated Config method delegates to CompletionConfig, so it will also emit the $ld:ai:usage:completion-config tracking event — confirm this is desired behavior

Additional context

• Link to Devin run: https://app.devin.ai/sessions/6d9d054b9f0049b2987d755f9b7386bb
• Requested by: @jsonbailey
• Local build/test verification was not possible due to missing dotnet SDK on dev machine; relying on CI for verification
• All 16 CI checks pass (including Cursor Bugbot)

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Note

Medium Risk
Introduces an interface/API rename (with obsolete shim) and changes analytics event emission, which can affect downstream callers and telemetry volume/semantics.

Overview
Updates the .NET AI SDK's telemetry to match the latest spec: LdAiClient now emits $ld:ai:usage:completion-config when retrieving a config, and fires a one-time-per-instance $ld:ai:sdk:info event on construction containing SDK name/version/language.

Renames the public API from Config to CompletionConfig on ILdAiClient/LdAiClient, keeps Config as an [Obsolete] shim, and factors config retrieval into a private Evaluate method so future entry points can track usage without double-counting.

Adds SdkInfo (and includes it in release-please-config.json extra-files) and updates tests to use CompletionConfig plus new assertions for the tracking events.

^{Written by Cursor Bugbot for commit 11e992f. This will update automatically on new commits. Configure here.}

[devin-ai-integration]

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[cursor]

Cursor Bugbot has reviewed your changes and found 1 potential issue.

[kinyoklion]

Does the wording here need to change to match the naming? LaunchDarkly AI Completion Config or something?

[devin-ai-integration]

Good call — updated the doc comments in both ILdAiClient.cs and LdAiClient.cs to use "AI Completion Config" naming consistently (summary, param descriptions, and return value docs). See 11e992f.