[Bug] Non-atomic writes to .claude.json cause file corruption and session crashes

Bug Description
.claude.json becomes corrupted due to non-atomic write process, causing all active Claude Code sessions to crash. The fix is to convert to an atomic write process.

Environment Info

• Platform: win32
• Terminal: windows-terminal
• Version: 2.1.59
• Feedback ID: 6274f61a-df73-4760-9f3d-c23b9e0aff46

Errors

[{"error":"ConfigParseError: JSON Parse error: Unexpected EOF\n    at g$H (B:/~BUN/root/claude.exe:6269:7698)\n    at P$ (B:/~BUN/root/claude.exe:6269:4734)\n    at DL (B:/~BUN/root/claude.exe:6263:9703)\n    at hb (B:/~BUN/root/claude.exe:6263:11504)\n    at uII (B:/~BUN/root/claude.exe:6263:5962)\n    at Ju$ (B:/~BUN/root/claude.exe:6263:5996)\n    at gyE (B:/~BUN/root/claude.exe:6282:22393)\n    at d (B:/~BUN/root/claude.exe:14:1502)\n    at g$H (B:/~BUN/root/claude.exe:6274:205)\n    at P$ (B:/~BUN/root/claude.exe:6269:4734)","timestamp":"2026-02-26T17:08:02.296Z"},{"error":"ConfigParseError: JSON Parse error: Unexpected EOF\n    at g$H (B:/~BUN/root/claude.exe:6269:7698)\n    at P$ (B:/~BUN/root/claude.exe:6269:4734)\n    at DL (B:/~BUN/root/claude.exe:6263:9703)\n    at hb (B:/~BUN/root/claude.exe:6263:11504)\n    at uII (B:/~BUN/root/claude.exe:6263:5962)\n    at Ju$ (B:/~BUN/root/claude.exe:6263:5996)\n    at gyE (B:/~BUN/root/claude.exe:6282:22393)\n    at d (B:/~BUN/root/claude.exe:14:1502)\n    at g$H (B:/~BUN/root/claude.exe:6274:205)\n    at P$ (B:/~BUN/root/claude.exe:6269:4734)","timestamp":"2026-02-26T17:08:02.297Z"},{"error":"ConfigParseError: JSON Parse error: Unexpected EOF\n    at g$H (B:/~BUN/root/claude.exe:6269:7698)\n    at P$ (B:/~BUN/root/claude.exe:6269:4734)\n    at DL (B:/~BUN/root/claude.exe:6263:9703)\n    at hb (B:/~BUN/root/claude.exe:6263:11504)\n    at uII (B:/~BUN/root/claude.exe:6263:5962)\n    at Ju$ (B:/~BUN/root/claude.exe:6263:5996)\n    at gyE (B:/~BUN/root/claude.exe:6282:22393)\n    at d (B:/~BUN/root/claude.exe:14:1502)\n    at g$H (B:/~BUN/root/claude.exe:6274:205)\n    at P$ (B:/~BUN/root/claude.exe:6269:4734)","timestamp":"2026-02-26T17:08:02.297Z"},{"error":"ConfigParseError: JSON Parse error: Unexpected EOF\n    at g$H (B:/~BUN/root/claude.exe:6269:7698)\n    at P$ (B:/~BUN/root/claude.exe:6269:4734)\n    at DL (B:/~BUN/root/claude.exe:6263:9703)\n    at hb (B:/~BUN/root/claude.exe:6263:11504)\n    at uII (B:/~BUN/root/claude.exe:6263:5962)\n    at Ju$ (B:/~BUN/root/claude.exe:6263:5996)\n    at gyE (B:/~BUN/root/claude.exe:6282:22393)\n    at d (B:/~BUN/root/claude.exe:14:1502)\n    at g$H (B:/~BUN/root/claude.exe:6274:205)\n    at P$ (B:/~BUN/root/claude.exe:6269:4734)","timestamp":"2026-02-26T17:08:02.298Z"},{"error":"ConfigParseError: JSON Parse error: Unexpected EOF\n    at g$H (B:/~BUN/root/claude.exe:6269:7698)\n    at P$ (B:/~BUN/root/claude.exe:6269:4734)\n    at DL (B:/~BUN/root/claude.exe:6263:9703)\n    at hb (B:/~BUN/root/claude.exe:6263:11504)\n    at uII (B:/~BUN/root/claude.exe:6263:5962)\n    at Ju$ (B:/~BUN/root/claude.exe:6263:5996)\n    at gyE (B:/~BUN/root/claude.exe:6282:22393)\n    at d (B:/~BUN/root/claude.exe:14:1502)\n    at g$H (B:/~BUN/root/claude.exe:6274:205)\n    at P$ (B:/~BUN/root/claude.exe:6269:4734)","timestamp":"2026-02-26T17:08:02.298Z"},{"error":"ConfigParseError: JSON Parse error: Unexpected EOF\n    at g$H (B:/~BUN/root/claude.exe:6269:7698)\n    at P$ (B:/~BUN/root/claude.exe:6269:4734)\n    at DL (B:/~BUN/root/claude.exe:6263:9703)\n    at hb (B:/~BUN/root/claude.exe:6263:11504)\n    at uII (B:/~BUN/root/claude.exe:6263:5962)\n    at Ju$ (B:/~BUN/root/claude.exe:6263:5996)\n    at gyE (B:/~BUN/root/claude.exe:6282:22393)\n    at d (B:/~BUN/root/claude.exe:14:1502)\n    at g$H (B:/~BUN/root/claude.exe:6274:205)\n    at P$ (B:/~BUN/root/claude.exe:6269:4734)","timestamp":"2026-02-26T17:08:02.299Z"},{"error":"ConfigParseError: JSON Parse error: Unexpected EOF\n    at g$H (B:/~BUN/root/claude.exe:6269:7698)\n    at P$ (B:/~BUN/root/claude.exe:6269:4734)\n    at DL (B:/~BUN/root/claude.exe:6263:9703)\n    at hb (B:/~BUN/root/claude.exe:6263:11504)\n    at uII (B:/~BUN/root/claude.exe:6263:5962)\n    at Ju$ (B:/~BUN/root/claude.exe:6263:5996)\n    at gyE (B:/~BUN/root/claude.exe:6282:22393)\n    at d (B:/~BUN/root/claude.exe:14:1502)\n    at g$H (B:/~BUN/root/claude.exe:6274:205)\n    at P$ (B:/~BUN/root/claude.exe:6269:4734)","timestamp":"2026-02-26T17:08:02.299Z"},{"error":"ConfigParseError: JSON Parse error: Unexpected EOF\n    at g$H (B:/~BUN/root/claude.exe:6269:7698)\n    at P$ (B:/~BUN/root/claude.exe:6269:4734)\n…

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