[Bug] Usage metrics reporting inflated token counts for short sessions

Bug Description
Weekly usage suspiciously high on a short session, 33% weekly usage consumed on a session that used 286K tokens with Haiku.

<img width="486" height="146" alt="Image" src="https://github.com/user-attachments/assets/c0148fdc-c237-44dd-ba37-3e72775173c7" />

Environment Info

• Platform: darwin
• Terminal: tmux
• Version: 2.1.4
• Feedback ID: c0e2c878-6ea0-45ee-9a59-1210ad3350ba

Errors

[{"error":"AbortError: The operation was aborted.\n    at unknown\n    at abortChildProcess (node:child_process:935:42)\n    at onAbortListener2 (node:child_process:35:24)\n    at abort (unknown)\n    at <anonymous> (/$bunfs/root/claude:4996:6756)","timestamp":"2026-01-11T16:29:05.992Z"},{"error":"Error: EISDIR: illegal operation on a directory, read\n    at readFileSync (unknown)\n    at <anonymous> (/$bunfs/root/claude:12:535)\n    at p2 (/$bunfs/root/claude:11:34641)\n    at readFileSync (/$bunfs/root/claude:12:494)\n    at UP_ (/$bunfs/root/claude:4612:23301)\n    at call (/$bunfs/root/claude:1615:945)\n    at call (/$bunfs/root/claude:1611:6420)\n    at eB8 (/$bunfs/root/claude:3199:27250)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-01-11T17:00:18.878Z"},{"error":"Error: Request was aborted.\n    at makeRequest (/$bunfs/root/claude:858:3940)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-01-11T17:02:55.210Z"},{"error":"Error: EISDIR: illegal operation on a directory, read\n    at readFileSync (unknown)\n    at <anonymous> (/$bunfs/root/claude:12:535)\n    at p2 (/$bunfs/root/claude:11:34641)\n    at readFileSync (/$bunfs/root/claude:12:494)\n    at UP_ (/$bunfs/root/claude:4612:23301)\n    at call (/$bunfs/root/claude:1615:945)\n    at call (/$bunfs/root/claude:1611:6420)\n    at eB8 (/$bunfs/root/claude:3199:27250)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-01-11T17:03:30.546Z"},{"error":"AbortError: The operation was aborted.\n    at unknown\n    at abortChildProcess (node:child_process:935:42)\n    at onAbortListener2 (node:child_process:35:24)\n    at abort (unknown)\n    at <anonymous> (/$bunfs/root/claude:4619:2185)","timestamp":"2026-01-11T17:07:32.137Z"},{"error":"Error: Request was aborted.\n    at makeRequest (/$bunfs/root/claude:858:3940)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-01-11T17:10:35.388Z"},{"error":"Error: EISDIR: illegal operation on a directory, read\n    at readFileSync (unknown)\n    at <anonymous> (/$bunfs/root/claude:12:535)\n    at p2 (/$bunfs/root/claude:11:34641)\n    at readFileSync (/$bunfs/root/claude:12:494)\n    at UP_ (/$bunfs/root/claude:4612:23301)\n    at call (/$bunfs/root/claude:1615:945)\n    at call (/$bunfs/root/claude:1611:6420)\n    at eB8 (/$bunfs/root/claude:3199:27250)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-01-12T14:31:08.380Z"},{"error":"Error: Request was aborted.\n    at makeRequest (/$bunfs/root/claude:858:3940)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-01-12T14:36:35.112Z"},{"error":"Error: Request was aborted.\n    at makeRequest (/$bunfs/root/claude:858:3940)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-01-12T14:45:37.921Z"},{"error":"Error: 1P event logging: 23 events failed to export\n    at queueFailedEvents (/$bunfs/root/claude:212:2077)\n    at async doExport (/$bunfs/root/claude:212:1257)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-01-12T15:45:06.730Z"},{"error":"Error: {\"message\":\"Failed to export 23 events\",\"originalLine\":\"212\",\"originalColumn\":\"1336\",\"line\":\"212\",\"column\":\"1336\",\"sourceURL\":\"/$bunfs/root/claude\",\"stack\":\"Error: Failed to export 23 events\\n    at doExport (/$bunfs/root/claude:212:1336)\\n    at processTicksAndRejections (native:7:39)\",\"name\":\"Error\"}\n    at error (/$bunfs/root/claude:1841:25028)\n    at <anonymous> (/$bunfs/root/claude:206:38555)\n    at nOD (/$bunfs/root/claude:206:39099)\n    at <anonymous> (/$bunfs/root/claude:207:17366)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-01-12T15:45:06.731Z"},{"error":"Error: 1P event logging: 3 events failed to export\n    at queueFailedEvents (/$bunfs/root/claude:212:2077)\n    at async doExport (/$bunfs/root/claude:212:1257)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-01-12T15:45:35.424Z"},{"error":"Error: {\"message\":\"Failed to export 3 events\",\"originalLine\":\"212\",\"originalColumn\":\"1336\",\"line\":\"212\",\"column\":\"1336\",\"sourceURL\":\"/$bunfs/root/claude\",\"stack\":\"Error: Failed to export 3 events\\n    at doExport (/$bunfs/root/claude:212:1336)\\n    at processTicksAndRejections (native:7:39)\",\"name\":\"Error\"}\n    at error (/$bunfs/root/claude:1841:25

Note: Error logs were truncated.