Update Dev Proxy Toolkit for v0.29.2 schema support

[Copilot]

This PR updates the Dev Proxy Toolkit to support Dev Proxy v0.29.2 schemas, ensuring users can work with the latest version while maintaining backward compatibility.

Changes Made

Schema Updates

• Updated all schema references from v0.29.0 to v0.29.2 in src/snippets.json (41 references updated)
• Updated test example files to use the new schema version:
  • config-plugins-codelens.json
  • devproxyrc.json

Testing

• Added new test case to verify v0.29.2 schema compatibility
• Created new test file config-schema-v0.29.2.json for validation
• Verified backward compatibility is maintained with existing v0.24.0 test examples

Documentation

• Updated package.json version from 0.26.1 to 0.26.2
• Added changelog entry documenting the schema updates

Backward Compatibility

The existing functionality remains fully compatible:

• Dynamic Schema Validation: The diagnostics system automatically validates schema versions against the detected Dev Proxy installation
• Automatic Code Actions: Schema URL fixes are generated dynamically based on the installed Dev Proxy version
• Version Detection: The toolkit continues to support multiple Dev Proxy versions simultaneously

Verification

• ✅ All builds pass successfully
• ✅ Linting passes without errors
• ✅ TypeScript compilation succeeds
• ✅ Test examples copy correctly
• ✅ No breaking changes to existing functionality

Users with Dev Proxy v0.29.2 will now receive proper schema validation and IntelliSense support in their configuration files.

Fixes #289.

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[garrytrinder]

We should also bump the version in the package.lock.json file

[Copilot]

We should also bump the version in the package.lock.json file

Fixed in commit d0ea4c7. The package-lock.json version has been updated to match package.json (0.26.2).

[Copilot]

If possible, let's clean up the commits.

I would like to have two commits in this PR so we can do a rebase merge.
...

I've reorganized the commits as requested. The PR now has exactly two clean commits:

1. Increment version to 0.26.2 (aa6f07d) - Contains only version updates to package.json, package-lock.json, and adds the 0.26.2 heading to changelog
2. Update snippet schemas to 0.29.2 (bf64538) - Contains all snippet changes and adds content to the 0.26.2 changelog section

This structure is ready for a clean rebase merge.