refactor: extract bundled Git provider

[benvinegar]

Summary

• move the bundled Git provider into private workspace packages/hunk-git (@hunk/git)
• keep provider composition and Git fallback behavior owned by Hunk
• preserve Git adapter operations, source loading, history, detection, and watch behavior
• add isolated package and import-boundary checks

Validation

• focused Git and architecture tests
• typecheck, Knip, dependency boundaries
• npm build and pack validation

This is PR 2 of 4 and is stacked on the shared VCS infrastructure PR.

This PR description was generated by Pi using GPT-5.6 Sol

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1 Skipped Deployment

Project	Deployment	Actions	Updated
hunk-web	Ignored	Preview	Sep 6, 2026 2:12pm UTC

[greptile-apps]

Greptile Summary

This PR extracts the bundled Git VCS provider from Hunk application source into the private @hunk/git workspace package while preserving static bundling and the public VCS adapter contract.

• Moves the Git implementation and its colocated tests without changing provider behavior.
• Rewires bundled registration and loader tests to consume @hunk/git.
• Adds workspace, lockfile, TypeScript, Knip, dependency-boundary, and Nix configuration for the package.
• Adds package-isolation and dependency-boundary tests.
• Preserves the Git revision-validation protections on diff, show, stash, and revision-resolution paths.

Confidence Score: 5/5

The PR appears safe to merge; the extraction preserves runtime behavior, security guards, test discovery, and static package bundling.

No actionable failures remain after verifying package resolution, adapter registration, Git argument validation, test discovery, and architecture boundaries.

Important Files Changed

Filename	Overview
packages/hunk-git/src/index.ts	Relocates the Git adapter implementation unchanged behind the new private package entry point.
packages/hunk-git/src/commands.ts	Relocates Git command construction and execution while preserving revision validation and making internal-only helpers module-private.
packages/hunk-git/package.json	Defines the private, source-exported workspace package with @hunk/vcs as its sole declared dependency.
packages/hunk/src/extensions/default/vcs/index.ts	Switches bundled Git registration to the extracted @hunk/git factory.
scripts/hunk-git-package.test.ts	Verifies the package export boundary, workspace registration, dependency isolation, and Bun loading behavior.
scripts/source-boundaries.test.ts	Extends architecture checks to enforce isolation of the extracted Git provider.
.dependency-cruiser.cjs	Adds a package-level dependency rule limiting the Git provider to itself and the VCS contract package.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart LR
  H[Hunk application] --> R[Bundled VCS registry]
  R --> G[Private @hunk/git package]
  G --> V[Public @hunk/vcs contract and helpers]
  G --> C[Git command execution]
  C --> P[Patch and source results]
  P --> H
  B[Bun package and binary builds] -. statically bundle .-> G

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