chore: Drop unnecessary createTracker non-null assertions in getting-started examples

[jsonbailey]

Summary

LDAIConfig.createTracker is declared non-optional in packages/sdk/server-ai/src/api/config/types.ts, so the ! non-null assertion is unnecessary. Drop it across the three getting-started/ examples that still had it.

Affected files:

• packages/sdk/server-ai/examples/getting-started/bedrock/converse/src/index.ts
• packages/sdk/server-ai/examples/getting-started/openai/chat-completions/src/index.ts
• packages/sdk/server-ai/examples/getting-started/vercel-ai/generate-text/src/index.ts

Background

This PR was originally scoped against the pre-#1379 examples layout (with examples/openai/, examples/bedrock/, examples/openai-observability/, examples/direct-judge/, etc.). PR #1379 ("Align server-ai examples with EXAM-SDK-example spec") restructured the examples into features/ and getting-started/ subdirectories and absorbed most of the issues this PR originally targeted — including the OpenAIProvider class removal, aiConfig.tracker property usage, LDAIMetrics(usage:) literal, and trackSuccess({...}) arg bug. Three createTracker!() occurrences remain in the new getting-started/ examples; those are what this PR now fixes.

Refs AIC-2383. This PR is part of the AI Configs docs/example modernization sweep tracked in `python-agent-work/all-docs-review.md`.

Test plan

• Final grep sweep returns zero hits for `createTracker!()` under `packages/sdk/server-ai/examples/`
• `yarn workspaces foreach -pR --topological-dev --from '@launchdarkly/server-sdk-ai' run build` succeeds with the three affected example workspaces
• Spot-run the three examples to confirm no runtime change

🤖 Generated with Claude Code

---

Note

Low Risk
Low risk: changes are limited to TypeScript getting-started examples and only remove ! non-null assertions from aiConfig.createTracker, with no runtime behavior change expected.

Overview
Cleans up the server-ai getting-started examples to call aiConfig.createTracker() directly (without the ! non-null assertion) in the Bedrock converse, OpenAI chat-completions, and Vercel AI generate-text samples.

This aligns the examples with the SDK typings where createTracker is non-optional and avoids masking potential type issues.

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