Temp filename prefix can push long leafNames past NAME_MAX filesystem limit

[dzackgarza]

Codex reviewer flagged in PR #7 (src/bootstrap.ts:223): prepending local-write-api-- to sourceFile.leafName can push otherwise valid long filenames past common filesystem NAME_MAX limits (typically 255 bytes on Linux/macOS). The fix should truncate the leafName component so the total stays under the limit.

Suggested by: chatgpt-codex-connector[bot] on PR #7
Thread: PRRT_kwDORiY8Nc50eWc8