fix(vcs): batch untracked diff checks

[CreatorGhost]

Port of upstream anomalyco/opencode#35997.

Adds diffUntracked() using a temporary git index so untracked-file diffs are computed in one batched git invocation instead of per-file spawns — a large speedup for repos with many untracked files and for no-HEAD (freshly-initialized) repos.

Verified: bun test test/project/vcs.test.ts (14 pass) and bun typecheck from packages/opencode. Applied cleanly.

Summary by CodeRabbit

• New Features

  • Added support for displaying patches and file statistics for untracked files.
  • Untracked changes are now included in diff results for repositories without an initial commit.
  • Improved handling of files with special characters in their names.

• Bug Fixes

  • Diff generation now reliably falls back when untracked-file processing cannot be completed.
  • Improved patch batching for mixed tracked and untracked changes.

[coderabbitai]

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Review failed

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: f25a28ee-0cbb-4828-bcf1-02e33c62c33d

📥 Commits

Reviewing files that changed from the base of the PR and between b834fdc and 53e9832.

📒 Files selected for processing (3)

• packages/opencode/src/git/index.ts
• packages/opencode/src/project/vcs.ts
• packages/opencode/test/project/vcs.test.ts

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📝 Walkthrough

Walkthrough

Adds a Git API for batching untracked patches and statistics through a temporary index. The VCS layer uses these batches for repositories without a HEAD, with tests covering call sequencing, per-file metadata, and special filenames.

Changes

Untracked diff batching

Layer / File(s)	Summary
Git untracked diff API packages/opencode/src/git/index.ts	Adds diffUntracked, using nul-delimited pathspecs, a temporary Git index, unified patch and numstat commands, fail-closed results, and cleanup.
Patch batch handling packages/opencode/src/project/vcs.ts	Adds PatchBatch.includesUntracked and propagates it through untracked batching and capped per-file patch handling.
No-HEAD VCS integration and validation packages/opencode/src/project/vcs.ts, packages/opencode/test/project/vcs.test.ts	Builds untracked batches when no HEAD exists and tests patch output, statistics, call order, and special filenames.

Estimated code review effort: 4 (Complex) | ~45 minutes

Sequence Diagram(s)

sequenceDiagram
  participant VcsTrack
  participant GitStatus
  participant GitDiffUntracked
  participant GitRepository
  VcsTrack->>GitStatus: inspect repository status
  GitStatus-->>VcsTrack: untracked files
  VcsTrack->>GitRepository: check HEAD
  GitRepository-->>VcsTrack: no HEAD
  VcsTrack->>GitDiffUntracked: batch untracked files
  GitDiffUntracked-->>VcsTrack: patch and statistics
  VcsTrack-->>GitRepository: construct per-file diff output

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✨ 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 vcs-batch-untracked

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