Windows: Claude Desktop AppData\Claude grows unboundedly, no relocation option; symlink/junction workaround breaks app on startup

### Preflight Checklist

- [x] I have searched [existing issues](https://github.com/anthropics/claude-code/issues?q=is%3Aissue%20state%3Aopen%20label%3Abug) and this hasn't been reported yet
- [x] This is a single bug report (please file separate reports for different bugs)
- [x] I am using the latest version of Claude Code

### What's Wrong?

%AppData%\Roaming\Claude grows continuously with no cleanup — in my case, largely from local-agent-mode-sessions\...\outputs, which accumulated hundreds of duplicate versioned files (e.g. Session_Review_Asks_and_Template_v9 through v24, near-identical, ~150-220KB each) plus stray .tmp files, filling my C: drive.

There's no built-in setting to relocate this data to another drive.

### What Should Happen?

Following the pattern in #57998 and #61350, I copied AppData\Roaming\Claude to a separate D: drive and created a directory junction (mklink /J, later also tried /D) at the original C: path pointing to D:.

Result: the app now refuses to start entirely, with the error:

Failed to start Claude's workspace
configure: path C:\Users[username]\AppData\Roaming\Claude is a symlink or junction, refusing to open

This matches the exact failure mode reported in #61350 ("Symbolic links and junctions to D: break the app on startup").

### Error Messages/Logs

```shell
Failed to start Claude’s workspaceconfigure: path C:\Users\Patrick Kager\AppData\Roaming\Claude is a symlink or junction, refusing to openRestarting Claude or your computer sometimes resolves this. If it persists, you can reinstall the workspace or share your debug logs to help us improve.
```

### Steps to Reproduce

Use mklink to symbolically link Appdata/Claude file to my D:

### Claude Model

Sonnet (default)

### Is this a regression?

Yes, this worked in a previous version

### Last Working Version

Never worked

### Claude Code Version

2.1.104

### Platform

Anthropic API

### Operating System

Windows

### Terminal/Shell

Other

### Additional Information

_No response_

The report names no source files or tests. Start by reproducing the Windows startup failure with the documented mklink junction and compare the behavior described in issues #57998 and #61350. Done should include bounded AppData growth, a supported relocation path, and successful startup when the data is moved.

Written by the indexing model from the issue text.