Fix macOS test failures from /var symlink canonicalization

[Copilot]

On macOS, /var is a symlink to /private/var. Tests were failing because glob returns /var/* paths while test assertions using path expand expect /private/var/*.

Changes

• Canonicalize glob results in discover.nu by applying path expand to ensure consistent path resolution across platforms

# Before
def list-files [pattern: string]: [nothing -> list<string>] {
  glob $pattern | path relative-to $env.PWD
}

# After  
def list-files [pattern: string]: [nothing -> list<string>] {
  glob $pattern | each { path expand } | path relative-to $env.PWD
}

This ensures both discovery and test assertions return the same canonical paths.

Original prompt

The tests are failing on Mac where we're expecting a folder with prefix /private/var but the actual paths are just /var. Identify the cause and fix the tests

---

💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.

[github-actions]

Test Results

  1 files  ±0   16 suites  ±0   0s ⏱️ ±0s
122 tests ±0  118 ✅ +3  4 💤 ±0  0 ❌  - 3 
122 runs  ±0  114 ✅ +3  8 💤 ±0  0 ❌  - 3 

Results for commit 565053f. ± Comparison against base commit 287e74a.

[github-actions]

Test Results

  1 files  ±0   16 suites  ±0   0s ⏱️ ±0s
122 tests ±0  118 ✅ +3  4 💤 ±0  0 ❌  - 3 
122 runs  ±0  114 ✅ +3  8 💤 ±0  0 ❌  - 3 

Results for commit 565053f. ± Comparison against base commit 287e74a.

[github-actions]

Test Results

  1 files  ±0   16 suites  ±0   0s ⏱️ ±0s
122 tests ±0  118 ✅ +3  4 💤 ±0  0 ❌  - 3 
122 runs  ±0  114 ✅ +3  8 💤 ±0  0 ❌  - 3 

Results for commit acf4c5f. ± Comparison against base commit 287e74a.

♻️ This comment has been updated with latest results.