Fix Main namespace handling in API documentation for aliased packages

[Copilot]

Problem

API documentation was incorrectly including "Main" in fully qualified names from dependencies. For example, when a dependency package "MyDep" exports a function DependencyFunction from its Main namespace, the documentation would show the fully qualified name as MyDep.Main.DependencyFunction instead of the expected MyDep.DependencyFunction.

This behavior was inconsistent with Q#'s namespace resolution rules, where Main namespaces in dependencies are treated as root namespaces and should be omitted from fully qualified names.

Solution

Modified the Metadata::fully_qualified_name() method in compiler/qsc_doc_gen/src/generate_docs.rs to omit "Main" namespaces when generating fully qualified names for aliased packages (dependencies). The fix ensures that:

• Dependencies with Main namespace: PackageAlias.ItemName (Main omitted)
• Dependencies with other namespaces: PackageAlias.Namespace.ItemName (namespace included)
• User code with Main namespace: Main.ItemName (Main preserved for user code)

Testing

Added comprehensive tests covering all scenarios:

• dependency_with_main_namespace_fully_qualified_name: Verifies Main namespace is omitted for dependencies
• dependency_with_non_main_namespace_fully_qualified_name: Verifies non-Main namespaces are preserved
• user_code_with_main_namespace_fully_qualified_name: Verifies user code behavior unchanged

All existing tests continue to pass, ensuring no regressions.

Example

Before:

Fully qualified name: MyDep.Main.DependencyFunction

After:

Fully qualified name: MyDep.DependencyFunction

Fixes #2145.

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[minestarks]

Reviewed and manually validated

[ScottCarda-MS]

I'm a bit confused by what this does. I expected it to remove the Main namespace node in the namespace paths for dependencies. But I'm still seeing that Main namespace:

@minestarks

[ScottCarda-MS]

Again, shouldn't explicitly declare namespace.

[Copilot]

Removed explicit namespace Main declaration from this test as well. The test now uses implicit Main namespace following modern Q# conventions. Commit 218f772

[ScottCarda-MS]

This explicit namespace is still here. The namespace Utils declaration doesn't need to be here because the namespace will be implicitly created by the name of the file it is in.

[Copilot]

I'm a bit confused by what this does. I expected it to remove the Main namespace node in the namespace paths for dependencies. But I'm still seeing that Main namespace:
![image](https://github.com/us...

You're absolutely right! My initial fix only addressed the "Fully qualified name" line but left the Main namespace in the UID and YAML metadata. I've now extended the fix to completely omit Main namespaces from aliased packages in all documentation contexts:

• UID: Qdk.DependencyFunction (instead of Qdk.Main.DependencyFunction)
• Namespace metadata: Empty (instead of "Main")
• Fully qualified name: MyDep.DependencyFunction (already working)

The fix is comprehensive now. Commit 03fba55

[ScottCarda-MS]

We don't need a test for implicit namespaces, as this is already the default behavior and is covered by the user_code_with_main_namespace_fully_qualified_name test.

[minestarks]

Okay Copilot, you've done enough. Why don't you take a little break.

[minestarks]

Abandoning this for now, since the sole reason I put up this PR is to see if Copilot would be able to handle it. It did an okay job, but missed enough details that we have to redo it. Will leave it for another PR.

Lesson: It's probably best to let Copilot do the initial draft, then the human owner should carefully review and test, and unassign from Copilot before publishing the PR. Revisions after code review should probably be handled by a human. Otherwise Copilot takes action on every single comment from reviewers, making a mess.