feat(desktop): add Show Me tool

[myu404]

Decision

This establishes a rule we now keep: worksheet Show Me actions use a dedicated typed Desktop tool instead of the generic command bridge.

Description

• Add show-me with the exact Show Me type values and optional datasource and field-selection inputs.
• Resolve worksheet names or stable IDs and send the action through the External Client API Operation pipeline.
• Hide the tool from Desktop API versions earlier than 0.2.11.

Motivation and Context

Agents need a first-class way to invoke the worksheet Show Me route after the Desktop-side route became available.

Type of Change

• Bug fix
• New feature
• Breaking change
• Documentation update
• Other (please describe):

How Has This Been Tested?

Targeted Desktop tool, transport, registry, schema-budget, and version-gate tests.

Verification

• npx vitest run src/tools/desktop/api/showMe.test.ts src/server.desktop.test.ts src/tools/toolName.test.ts src/server.desktop.schema-equivalence.test.ts

Related Issues

• None.

Checklist

• I have updated the version in the package.json file by using npm run version. For example,
  use npm run version:patch for a patch version bump.
• I have made any necessary changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• I have documented any breaking changes in the PR description. For example, renaming a config
  environment variable or changing its default value.

Contributor Agreement

By submitting this pull request, I confirm that:

• I have read the CONTRIBUTING guidelines for this project and followed
  its Contribution Checklist.