remove experiments toolset

[tommaso-moro]

Summary

I am removing the remaining code and docs referencing the experiments toolset

Why

We used to have an experiments toolset that was removed as part of the Go SDK migration, this PR removes the last few references to it.

What changed

• Remove it from docs
• Remove it from toolset metadata

MCP impact

• No tool or API changes
• Tool schema or behavior changed
• New tool added

Prompts tested (tool changes only)

• n/a

Security / limits

• No security or limits impact
• Auth / permissions considered
• Data exposure, filtering, or token/size limits considered

Lint & tests

• Linted locally with ./script/lint
• Tested locally with ./script/test

Docs

• Not needed
• Updated (README / docs / examples)

[Copilot]

Pull request overview

This PR completes the removal of the deprecated experiments toolset by cleaning up its last remaining references in the codebase.

• Removes the ToolsetMetadataExperiments variable definition from the toolset metadata declarations
• Updates Docker usage documentation to remove experiments from the example toolset list

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
pkg/github/tools.go	Removes the ToolsetMetadataExperiments variable definition that was no longer in use
README.md	Updates the Docker example command to remove experiments from the toolsets environment variable

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The changes look good and are complete. I've verified that:

• No remaining references to "experiments" or "ToolsetMetadataExperiments" exist in the codebase
• The removal is clean and doesn't leave any orphaned references
• The changes align with the stated purpose of removing the last remaining references to the deprecated toolset