add parameterless constructor to ServerCommit

[hahn-kev]

required to use in gql in lexbox

Summary by CodeRabbit

• Bug Fixes
  • Improved commit deserialization and initialization reliability.
  • Ensured commit instances receive valid identifiers when reconstructed from stored or remote data.
  • Resolved required-member initialization warnings during commit creation.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: b6ce28f1-0b4d-49a7-beef-4d2c8825db16

📥 Commits

Reviewing files that changed from the base of the PR and between 78cb077 and d7c3422.

📒 Files selected for processing (3)

• src/SIL.Harmony.Core/CommitBase.cs
• src/SIL.Harmony.Core/ServerCommit.cs
• src/SIL.Harmony/Commit.cs

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📝 Walkthrough

Walkthrough

The commit model constructors now declare required-member initialization. ServerCommit also has a private parameterless constructor that creates a new GUID for GraphQL deserialization.

Changes

Commit constructor initialization

Layer / File(s)	Summary
Constructor annotations and GraphQL deserialization src/SIL.Harmony.Core/CommitBase.cs, src/SIL.Harmony.Core/ServerCommit.cs, src/SIL.Harmony/Commit.cs	The commit constructors use SetsRequiredMembers. ServerCommit adds a private parameterless constructor that initializes the base commit with a new GUID.

Estimated code review effort: 2 (Simple) | ~10 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: adding a parameterless constructor to ServerCommit.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch parameterless-server-commit

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