fix: Update pre-release usage guidance

[jsonbailey]

Requirements

• I have added test coverage for new or changed functionality — N/A, documentation-only change
• I have followed the repository's pull request submission guidelines
• I have validated my changes against all supported platform versions — N/A, documentation-only change

Related issues

None.

Describe the solution you've provided

Four documentation changes:

1. Softened pre-release language in packages/sdk/server-ai/README.md: Removed the ⛔️ and ☝️ emoji header lines while keeping the > [!CAUTION] block. Replaced the old alpha warning with the revised pre-release notice:

   This SDK is in pre-release and not subject to backwards compatibility
   guarantees. The API may change based on feedback.

   Pin to a specific minor version and review the changelog before upgrading.

2. Added a package table to the root README.md: Lists the main SDK package and AI provider packages with PyPI badges and README links, modeled after the js-core monorepo README.

3. Added pre-release caution blocks to AI provider READMEs (server-ai-openai, server-ai-langchain): These previously had no pre-release notice. Added a > [!CAUTION] block with the same revised template, using "This package" instead of "This SDK".

4. Restructured root README.md to match the js-core layout: Replaced the "LaunchDarkly overview" section at the top with a short repository description. Moved "LaunchDarkly overview" further down the page (after "Learn more", before "Contributing"), matching the structure used in the js-core root README.

Updates since last revision

• Updated pinning line from "Pin to a specific minor version to avoid breaking changes." to "Pin to a specific minor version and review the changelog before upgrading." across all three package READMEs.
• Removed "or semantic versioning" from the caution text (done in a prior revision).

Human review checklist

• Verify the PyPI badge URL for the OpenAI provider — the provider's own README references launchdarkly-server-sdk-ai-openai-dev (with -dev suffix) while the root table uses launchdarkly-server-sdk-ai-openai (without -dev). Confirm which is correct.
• Confirm the [changelog](CHANGELOG.md) relative link resolves correctly from each package README on GitHub (each package directory contains its own CHANGELOG.md).
• Confirm the multi-line > [!CAUTION] blockquote renders correctly on GitHub (blank > line separating the two paragraphs, markdown link inside blockquote).

Additional context

• Link to Devin run: https://app.devin.ai/sessions/eb2400e69a824ad686e0bbd40301971d
• Requested by: @jsonbailey

---

Note

Low Risk
Documentation-only changes with no runtime or API behavior impact; main risk is minor confusion if package names/badge links are incorrect.

Overview
Refreshes documentation messaging to standardize a pre-release caution across the core launchdarkly-server-sdk-ai README and the server-ai-openai/server-ai-langchain provider READMEs, including explicit guidance to pin minor versions and review each package’s CHANGELOG.md before upgrading.

Reworks the root README.md to add a packages table (with PyPI badges and per-package README links) and to move the LaunchDarkly overview section lower on the page in favor of a short repository description up top.

^{Written by Cursor Bugbot for commit 6855076. This will update automatically on new commits. Configure here.}

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