Add Compare Selected for two File Nodes

[joesobo]

Summary

• show Compare Selected only when the captured Context Selection contains exactly two File Nodes
• handle the compare message with one extension-host action that runs VS Code's vscode.diff command
• keep the action hidden for folders, Symbols, Relationships, mixed selections, and selections with any count other than two

Diff sides

Selection insertion order defines the diff sides. The first selected File Node opens on the left, and the second selected File Node opens on the right. Right-clicking either selected Node keeps that captured order.

Verification

• focused Vitest: 78 tests passed
• TURBO_FORCE=true pnpm --filter @codegraphy-dev/extension run typecheck with zero cached tasks and output from this worktree
• focused ESLint on changed TypeScript and test files
• React Doctor: 100/100, no issues
• final PR diff: 17 files changed
• fresh Extension Development Host run on VS Code 1.132.0: selected src/index.ts, then src/palette.ts; the action opened index.ts ↔ palette.ts in VS Code's diff editor

Visual proof

Two selected File Nodes and the available action:

The resulting VS Code diff:

Trello

Trello #229: Add Compare Selected context menu action for two file nodes

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1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
codegraphy	Skipped		Aug 7, 2026 2:55pm

[changeset-bot]

🦋 Changeset detected

Latest commit: 974b293

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@codegraphy-dev/extension	Patch

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