fix: reject apply targets that are symlinks

[SutuSebastian]

Summary

apply phase-2 used temp-file + rename over the requested path. When that path was a symlink, POSIX rename replaced the link with a regular file — silent data-loss for repos that track symlinked sources.

Fix: lstat each target before read/write; emit conflict path is a symlink and skip phase 2 for that row.

Test plan

• Symlink link.ts → real.ts: apply reports conflict, link stays symlink, target unchanged
• bun test src/application/apply-engine.test.ts
• bun run typecheck
• CI green

[changeset-bot]

🦋 Changeset detected

Latest commit: 68efefd

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

This PR includes changesets to release 1 package

Name	Type
@stainless-code/codemap	Patch

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 7015cb6f-d7d8-49ac-a03c-94a393b65902

📥 Commits

Reviewing files that changed from the base of the PR and between 5ee5f2e and 68efefd.

📒 Files selected for processing (3)

• .changeset/fix-apply-symlink-conflict.md
• src/application/apply-engine.test.ts
• src/application/apply-engine.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/apply-preserve-symlinks

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