OAuth tokens not persisting - requires /login for each web handoff session

Environment

• OS: macOS 15.6.1 (Sequoia)
• Claude Code Version: 2.1.4

Problem

OAuth tokens are not being persisted to disk. Each new terminal session requires running /login before the & (web handoff) feature works.

Expected Behavior

After authenticating once, the OAuth tokens should persist across terminal sessions, allowing & web handoff to work without re-authentication.

Actual Behavior

• ~/.claude.json contains oauthAccount with account metadata (email, org UUID, display name)
• No accessToken, refreshToken, or expiresAt fields are stored
• Must run /login in each new terminal session to use & web handoff
• After /login, web handoff works correctly for that session

Diagnostic Output

$ cat ~/.claude.json | python3 -c "import sys,json; d=json.load(sys.stdin); print(json.dumps(d.get('oauthAccount', {}), indent=2))"
{
  "accountUuid": "...",
  "emailAddress": "...",
  "organizationUuid": "...",
  "hasExtraUsageEnabled": false,
  "displayName": "...",
  "organizationRole": "admin",
  "workspaceRole": null,
  "organizationName": "..."
}

Note: No token fields present. Grep for token|accessToken|refreshToken|expires only returns API usage token counts, not OAuth credentials.

Additional Context

• ~/.config/claude-code/ directory does not exist
• No keychain entry found for "claude-code"
• autoUpdates is set to false in config