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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[Copilot]

Pull request overview

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

Changes:

• Added an ecosystem table covering 4 repos with links, purpose summaries, NuGet links, and required CI checks.
• Documented shared branch protection rules across the ecosystem repos.
• Added a dependency graph and a short release flow checklist.

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[gemini-code-assist]

Code Review

This pull request updates AGENTS.md to document the ANcpLua ecosystem, including repository purposes, branch protection policies, dependency graphs, and release flows. The review identified two inaccuracies: the CI checks for ANcpLua.Roslyn.Utilities should include macOS for cross-platform consistency, and the dependency graph incorrectly labels ANcpLua.Agents as standalone despite its dependency on ANcpLua.Roslyn.Utilities.

[gemini-code-assist]

The CI checks for ANcpLua.Roslyn.Utilities are missing macos, whereas the other repositories in the ecosystem (including the downstream ANcpLua.Agents) include it. Since this is a cross-platform utility library, it should likely be built and verified on all three platforms for consistency.

Suggested change

	| [ANcpLua.Roslyn.Utilities](https://github.com/ANcpLua/ANcpLua.Roslyn.Utilities) | Source generator utilities, TryParse extensions, polyfills | [nuget.org](https://www.nuget.org/packages/ANcpLua.Roslyn.Utilities) | `build (ubuntu/windows)`, `version` |
	| [ANcpLua.Roslyn.Utilities](https://github.com/ANcpLua/ANcpLua.Roslyn.Utilities) | Source generator utilities, TryParse extensions, polyfills | [nuget.org](https://www.nuget.org/packages/ANcpLua.Roslyn.Utilities) | `build (ubuntu/windows/macos)`, `version` |

[gemini-code-assist]

The dependency graph describes ANcpLua.Agents as standalone, but this contradicts line 7 and line 21, which state that it consumes ANcpLua.Roslyn.Utilities. It also conflicts with the bootstrap chain mentioned in line 34. The graph should be updated to show this dependency.

Suggested change

	└── standalone (no first-party deps)
	└── consumes ANcpLua.Roslyn.Utilities