fix(tools): stop prefixing edit tool responses with line numbers

[Pixie-19]

Description

Fixes #765.

This PR removes line-number prefixes from the responses returned by the string_replace and write_file tools.

Previously these tools returned file contents like:

1: import ...
2: const x = ...

while read_file returned raw file contents without numbered prefixes. This inconsistency could cause follow-up edits to fail because string_replace expects the exact file contents.

The tools now return the raw file contents, making their output consistent with read_file.

Type of Change

• Bug fix
• New feature
• Breaking change
• Documentation update

Changeset

• Added a changeset (pnpm changeset) describing this change for the changelog

Testing

Automated Tests

• Existing TypeScript compilation passes (npm run test:types)
• Biome lint and format checks run successfully (schema version warning only)

Manual Testing

• Tested with Ollama
• Tested with OpenRouter
• Tested with OpenAI-compatible API
• Tested MCP integration (if applicable)

Checklist

• Code follows project style guidelines
• Self-review completed
• No breaking changes

[Copilot]

Pull request overview

This PR fixes an inconsistency between read_file and the edit tools (write_file, string_replace) by removing per-line line-number prefixes from the file contents those edit tools return. This makes follow-up content-based edits (especially string_replace, which requires exact matches) less likely to fail due to formatting differences introduced by tool output.

Changes:

• Update write_file to return the post-write file contents without per-line line numbers.
• Update string_replace to return the updated file contents without per-line line numbers.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
source/tools/file-ops/write-file.tsx	Removes the %4d: prefixing loop and returns the raw post-write file contents.
source/tools/file-ops/string-replace.tsx	Removes the %4d: prefixing loop and returns the raw updated file contents.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.