Fix CI pipeline and symlink resolution for 2.0.0

[gimlichael]

• Enable macOS tests on pull_request events in CI workflow
• Fix ContentRootValidator to recursively resolve chained symbolic links
• Add comprehensive test coverage for symlink chains and root directory cases
• Update README to clarify multi-OS CI behavior
• Update CHANGELOG.md with fixes section

This patch improves cross-platform symbolic link traversal and ensures complete test validation across all platforms during pull requests.

[greptile-apps]

Greptile Summary

The PR enables macOS validation for pull requests and recursively canonicalizes symbolic-link targets before content-root containment checks.

• Runs the macOS test matrix automatically for pull-request events while preserving the manual opt-in.
• Resolves symlink targets whose resulting paths traverse additional symbolic links.
• Adds root-directory and chained-symlink coverage and updates release documentation.

Confidence Score: 5/5

The PR appears safe to merge because no blocking failure remains in the eligible follow-up review scope.

No blocking failure remains.

Important Files Changed

Filename	Overview
.github/workflows/ci-pipeline.yml	Extends the macOS test gate to pull-request events while retaining the manual-run input condition.
src/Codebelt.Cdn.Origin/Hosting/ContentRootValidator.cs	Recursively canonicalizes the resolved target so symbolic links appearing within the target path are included in containment checks.
test/Codebelt.Cdn.Origin.Tests/Hosting/ContentRootValidatorTest.cs	Adds coverage for filesystem roots and symbolic-link targets that traverse another link.
README.md	Documents mandatory macOS pull-request testing and optional manually dispatched macOS testing.
CHANGELOG.md	Records the symbolic-link resolution and CI validation fixes for the release.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[Configured content root] --> B[Resolve parent path]
    B --> C[Combine resolved parent and directory name]
    C --> D{Directory exists?}
    D -- No --> E[Return candidate path]
    D -- Yes --> F{Symbolic-link target?}
    F -- No --> E
    F -- Yes --> G[Resolve final link target]
    G --> B
    E --> H[Compare with resolved application directory]

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_{Reviews (2): Last reviewed commit: "Update ContentRootValidator tests" | Re-trigger Greptile}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
⚠️ Please upload report for BASE (main@661a2a2). Learn more about missing BASE report.

Additional details and impacted files

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  Coverage        ?   100.00%           
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  Files           ?        19           
  Lines           ?       533           
  Branches        ?        67           
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  Hits            ?       533           
  Misses          ?         0           
  Partials        ?         0           

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