[mercury]:Annotations and minor refactoring of Git objects

[Ivanbeethoven]

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Name	Status	Preview	Comments	Updated (UTC)
mega	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 14, 2025 0:54am

[Copilot]

Pull Request Overview

Adds annotations, documentation, and minor refactorings around Git object types and model conversions.

• Introduces From<mega_commit::Model> and From<git_commit::Model> conversions in the Commit type
• Adds doc comments and cleans up constructors in Blob and SHA1 hashing
• Removes duplicate model-to-Commit impls and tidies imports in the internal model layer

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 4 comments.

File	Description
mercury/src/internal/object/commit.rs	Added #[non_exhaustive], docs for from_tree_id, and From<…Model> impls
mercury/src/internal/object/blob.rs	Added docs for from_content, removed dead code, and annotated hash calculation
mercury/src/internal/model/commit.rs	Removed redundant From<…Model> impls and cleaned up import formatting
mercury/src/hash.rs	Documented the from_type_and_data SHA1 construction algorithm

Comments suppressed due to low confidence (1)

mercury/src/hash.rs:105

• [nitpick] This doc line uses non-standard punctuation and formatting, which can be confusing. Consider rewriting it with standard parentheses and clearer wording, e.g., Hash = “<type> <length>\0<content>”.

    ///  Hash compute <- {Object Type}+{ }+{Object Size（before compress）}+{\x00}+{Object Content(before compress)}