CBL-8722: Generate the Swift private module maps from templates

[pasin]

Problem

• The CouchbaseLiteSwift_Private module maps are hand-maintained per edition in two repos, so the editions can drift apart if we forget to update both, and the CE repo's CI cannot verify the EE copy.

Solution

• Generate both editions' module maps in the CE repo from header list templates, following the Objective-C/Exports pattern.

Changes

• Add Swift/ModuleMap/ header list templates and generate_private_modulemap.sh; the EE module map is the CE header list plus the EE additions.
• Point CBL_Swift / CBL_EE_Swift xcconfigs at the generated module maps; the EE repo no longer hosts a module map.
• Verify the generated files are up to date in an github action.
• Enable MemberImportVisibility so a Swift file using a type it does not import itself fails to build (catches missing private module imports).
• Strip the private module map from the framework in Release builds only as they are required by the XCode Indexer.

Companion PR : https://github.com/couchbaselabs/couchbase-lite-ios-ee/pull/349

[Copilot]

Pull request overview

This PR reduces drift between Community Edition (CE) and Enterprise Edition (EE) Swift private module maps by generating both from header-list templates in the CE repo, and wiring builds/CI to use and validate the generated outputs.

Changes:

• Add Swift/ModuleMap header-list templates plus a generator script, and commit generated CE/EE private module maps.
• Update Swift (CE/EE) build settings to reference the generated module maps and enable MemberImportVisibility diagnostics.
• Update CI and packaging scripts and refresh repo guidance/docs for the new workflow.

Reviewed changes

Copilot reviewed 10 out of 13 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
xcconfigs/Project.xcconfig	Enables SWIFT_UPCOMING_FEATURE_MEMBER_IMPORT_VISIBILITY to catch missing imports.
xcconfigs/CBL_Swift.xcconfig	Points CE Swift target at generated private module map.
xcconfigs/CBL_EE_Swift.xcconfig	Points EE Swift target at generated EE private module map (no longer in EE repo).
Swift/ModuleMap/generate_private_modulemap.sh	Adds generator/check script to produce CE+EE module maps from templates.
Swift/ModuleMap/CouchbaseLiteSwift.private.txt	Adds CE header list template consumed by the generator.
Swift/ModuleMap/CouchbaseLiteSwift-EE.private.txt	Adds EE-only header list template consumed by the generator.
Swift/ModuleMap/Generated/CouchbaseLiteSwift.private.modulemap	Marks CE module map as generated and updates header.
Swift/ModuleMap/Generated/CouchbaseLiteSwift-EE.private.modulemap	Adds generated EE private module map output.
Swift/ModuleMap/Generated/CouchbaseLiteSwift-EE.private.txt	Adds an extra EE header list under Generated/ (currently duplicates the template).
Scripts/pull_request_build_test.sh	Adds a CI check to ensure generated module maps are up to date.
Scripts/remove_private_module.sh	Strips private module only for Release* builds to preserve Xcode indexing for dev builds.
CouchbaseLite.xcodeproj/project.pbxproj	Adds ModuleMap groups/files to the Xcode project.
AGENTS.md	Updates contributor guidance for the new module map generation workflow.

Suppressed comments (1)

CouchbaseLite.xcodeproj/project.pbxproj:3458

• The new ModuleMap/Generated group contains the CE generated module map but also includes CouchbaseLiteSwift-EE.private.txt (a header-list template), while the generated EE module map file isn’t listed. This layout makes it easy to edit the wrong file and defeats the “generated output vs template” separation.

			isa = PBXGroup;
			children = (
				40F52B1D3026ED0F009C5F9E /* CouchbaseLiteSwift.private.modulemap */,
				40CC4B78302BE6EF0002386D /* CouchbaseLiteSwift-EE.private.txt */,
			);

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[Copilot]

Pull request overview

Copilot reviewed 10 out of 12 changed files in this pull request and generated no new comments.