docs(agents): add ecosystem table

[ANcpLua]

Adds cross-repo ecosystem reference with NuGet links, required CI checks, branch protection rules, dependency graph, and release flow.

[coderabbitai]

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[gemini-code-assist]

Code Review

This pull request adds a new 'ANcpLua Ecosystem' section to AGENTS.md, providing a detailed overview of the project's repositories, branch protection policies, dependency graph, and release flow. Feedback was provided regarding the branch protection policy, suggesting a requirement of at least one approval for PRs to ensure better code quality. Additionally, several inconsistencies were identified in the CI checks table, specifically concerning versioning terminology, missing NuGet packaging steps, and inconsistent platform coverage across the repositories.

[gemini-code-assist]

The branch protection policy specifies 0 approvals. This is unusual for a 'protected' branch, as it effectively allows any user with write access to merge their own PRs without peer review. If the intention is to ensure code quality and security through review, this should likely be at least 1 approval. If 0 is intentional (e.g., for a specific automation flow), it might be worth clarifying why it is listed under 'protection'.

Suggested change

	- PR required to merge into `main` (0 approvals, squash preferred)
	- PR required to merge into `main` (1 approval, squash preferred)

[gemini-code-assist]

The CI checks required column contains several inconsistencies across the ecosystem repositories:

1. Versioning: ANcpLua.NET.Sdk uses compute_version, while Utilities and Agents use version. Analyzers is missing a versioning check entirely.
2. NuGet Packaging: create_nuget is only listed for the SDK, despite all four repositories publishing to NuGet.
3. Platform Coverage: ANcpLua.Roslyn.Utilities is missing macos in its build matrix, whereas the other repositories include it.
4. Terminology: There is a mix of build and test labels.

Standardizing these names and ensuring all required gates (like versioning and package creation) are documented for each repo would improve the clarity of the ecosystem overview.

[Copilot]

Pull request overview

Adds an “ANcpLua Ecosystem” reference section to AGENTS.md to document the related repos, their NuGet packages, CI requirements, branch protection expectations, dependency relationships, and a high-level release flow.

Changes:

• Added an ecosystem table covering 4 repos (purpose, NuGet links, required CI checks).
• Documented shared branch protection rules and a simple dependency graph.
• Added a brief release flow description.

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