refactor: rename ege-setup to ege-installer for clarity

[wysaid]

Motivation

The current output filename ege-setup-*.exe creates semantic confusion:

• setup implies configuration/initialization, but this is a pure installer
• Inconsistent with project name (ege-installer) and build script (build-installer.sh)
• Less clear for end users searching for an installer

Changes

1. Filename Rename

Before: ege-setup-<version>.exe
After: ege-installer-<version>.exe

Updated references in:

• scripts/installer.nsi - NSIS OutFile directive
• scripts/build.ps1 - Output path validation
• .github/workflows/build.yml - Artifact naming
• README.md - Download instructions and build output docs
• INSTALLATION.md - User guide references (3 locations)

2. Smart EGE Libs Path Detection

Added intelligent auto-detection for EGE library directory:

Candidate paths (tried in order):

1. ../xege_libs (default, for standalone ege-installer)
2. .. (parent directory, for building within xege-sdk project)

Validation: New Test-EgeLibsDirectory function checks:

• include/ege.h exists
• lib/ directory exists
• version.txt exists

Benefits:

• No manual path config needed when cloned inside xege-sdk
• Clear error messages showing searched locations
• Prevents accidental builds with invalid library paths

Benefits

✅ Aligns filename with project name for consistency
✅ Clearer semantic meaning ("installer" vs "setup")
✅ Better search discoverability
✅ Matches Windows installer naming conventions
✅ Auto-detects EGE libs from multiple locations

Compatibility

This is a breaking change for automated scripts that reference the old filename. Recommend coordinating release with dependent projects (e.g., xege-sdk).

Related PR: x-ege/xege-sdk#74

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch rename-setup-to-installer

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[Copilot]

Pull request overview

Renames the generated installer executable from ege-setup-*.exe to ege-installer-*.exe to better match the project naming and improve clarity across build outputs, CI artifacts, and docs.

Changes:

• Updated NSIS OutFile to produce ege-installer-${VERSION}.exe.
• Updated PowerShell build script to expect/validate ege-installer-$Version.exe.
• Updated CI artifact name and user/developer documentation references to the new filename.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
scripts/installer.nsi	Changes NSIS output filename to ege-installer-${VERSION}.exe.
scripts/build.ps1	Updates final output path check/logging to ege-installer-$Version.exe.
README.md	Updates download and build output references to ege-installer-*.exe.
INSTALLATION.md	Updates user-facing instructions/examples to ege-installer-*.exe.
.github/workflows/build.yml	Renames uploaded artifact to ege-installer-${VERSION}.

[augmentcode]

🤖 Augment PR Summary

Summary: Renames the generated installer from ege-setup-.exe to ege-installer-.exe for clearer semantics and alignment with the project name.

Changes: Updates CI artifact naming, NSIS OutFile, the PowerShell build script output path, and README/INSTALLATION documentation references to the new filename.

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[augmentcode]

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