[Repo Assist] fix: always close stdin in format() regardless of debug mode

[github-actions]

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Summary

When phpcbf.debug is true, exec.stdin was left open after spawning the phpcbf process. This caused phpcbf to block waiting for stdin input, which manifested as the onWillSaveTextDocument-listener threw ERROR: timeout seen in issue #35.

phpcbf always operates on a temp file passed as a CLI argument — it never reads from stdin — so stdin should be closed immediately after spawn regardless of the debug setting.

Root Cause

// Before (buggy): stdin only closed when debug is false
let exec = cp.spawn(this.executablePath, this.getArgs(document, fileName));
if (!this.debug) {
    exec.stdin.end();
}

Fix

// After: stdin always closed
let exec = cp.spawn(this.executablePath, this.getArgs(document, fileName));
exec.stdin.end();
```

## Trade-offs

None. The debug flag controls logging verbosity (`-l` vs `-lq` in `getArgs`), not stdin behaviour. Closing stdin unconditionally is correct in both modes.

## Test Status

All 7 existing unit tests pass:

```
# tests 7
# pass 7
# fail 0

Closes #35

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[github-actions]

🤖 This is an automated note from Repo Assist.

This PR appears to be a duplicate of PR #90 ("[Repo Assist] fix: always close stdin in format() regardless of debug mode (closes #35)"), which covers the same change with a more complete description referencing the issue it closes.

I'd recommend closing this PR and tracking the fix via PR #90 instead.

Generated by Repo Assist · ◷

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gh aw add githubnext/agentics/workflows/repo-assist.md@346204513ecfa08b81566450d7d599556807389f